This type of word-building, in which new words are produced by combining two or more stems.
There are at least three aspects of composition that present special interest.
The first is the structural aspect. Compounds are not homogeneous in structure. Traditionally three types are distinguished: neutral, morphological and syntactic.
In neutral compounds the process of compounding is realised without any linking elements, by a mere juxtaposition of two stems, as in blackbird, shop-window, sunflower, bedroom, tallboy, etc. There are three subtypes of neutral compounds depending on the structure of the constituent stems.
Compounds which have affixes in their structure are called derived or derivational compounds. E. g. absent-mindedness, blue-eyed, golden-haired, broad-shouldered, lady-killer, film-goer, music-lover, honey-mooner, first-nighter, late-comer, newcomer, early-riser, evildoer.
The third subtype of neutral compounds is called contracted compounds. These words have a shortened (contracted) stem in their structure: TV-set (-program, -show, -canal, etc.), V-day (Victory day), G-man (Government man "FBI agent"), H-bag (handbag), T-shirt, etc.
Morphological compounds are few in number. This type is non-productive. It is represented by words in which two compounding stems are combined by a linking vowel or consonant, e. g. Anglo-Saxon, Franko-Prussian, handiwork, handicraft, craftsmanship, spokesman, statesman
In syntactic compounds (the term is arbitrary) we once more find a feature of specifically English word-structure. These words are formed from segments of speech, preserving in their structure numerous traces of syntagmatic relations typical of speech: articles, prepositions, adverbs, as in the nouns lily-of-the-valley, Jack-of-all-trades, good-for-nothing, mother-in-law, sit-at-home. Syntactical relations and grammatical patterns current in present-day English can be clearly traced in the structures of such compound nouns as pick-me-up, know-all, know-nothing, go-between, get-together, whodunit.
can the meaning of a compound word be regarded as the sum of its constituent meanings?
To try and answer this question, let us consider the following groups of examples.
(1) Classroom, bedroom, working-man, evening-gown, dining-room, sleeping-car, reading-room, dancing-hall.
This group seems to represent compounds whose meanings can really be described as the sum of their constituent meanings. Yet, in the last four words we can distinctly detect a slight shift of meaning. The first component in these words, if taken as a free form, denotes an action or state of whatever or whoever is characterised by the word. Yet, a sleeping-car is not a car
that sleeps (cf. a sleeping child), nor is a dancing-hall actually dancing (cf. dancing pairs).
The shift of meaning becomes much more pronounced in the second group of examples.
(2) Blackboard, blackbird, football, lady-killer, pick
pocket, good-for-nothing, lazybones, chatterbox.
In these compounds one of the components (or both) has changed its meaning: a blackboard is neither a board nor necessarily black, football is not a ball but a game, a chatterbox not a box but a person, and a lady-killer kills no one but is merely a man who fascinates women. It is clear that in all these compounds the meaning of the whole word cannot be defined as the sum of the constituent meanings. The process of change of meaning in some such words has gone so far that the meaning of one or both constituents is no longer in the least associated with the current meaning of the corresponding free form, and yet the speech community quite calmly accepts such seemingly illogical word groups as a white blackbird, pink bluebells or an entirely confusing statement like: Blackberries are red when they are green.
Yet, despite a certain readjustment in the semantic structure of the word, the meanings of the constituents of the compounds of this second group are still transparent: you can see through them the meaning of the whole complex. Knowing the meanings of the constituents a student of English can get a fairly clear idea of what the whole word means even if he comes across it for the first time. At least, it is clear that a blackbird is some kind of bird and that a good-for-nothing is not meant as a compliment.
(3) In the third group of compounds the process of
deducing the meaning of the whole from those of the
constituents is impossible. The key to meaning seems to
have been irretrievably lost: ladybird is not a bird, but
an insect, tallboy not a boy but a piece of furniture,
bluestocking, on the contrary, is a person, whereas bluebottle may denote both a flower and an insect but never a bottle.
Similar enigmas are encoded in such words as man-of-war ("warship"), merry-to-round ("carousel"), mother-of-pearl ("irridescent substance forming the inner layer of certain shells"), horse-marine ("a person who is unsuitable for his job or position"), butter-fingers ("clumsy person; one who is apt to drop things"), wall-flower ("a girl who is not invited to dance at a party"), whodunit ("detective story"), straphanger (1. "a passenger who stands in a crowded bus or underground train and holds onto a strap or other support suspended from above"; 2. "a book of light genre, trash; the kind of book one is likely to read when travelling in buses or trains").
The compounds whose meanings do not correspond to the separate meanings of their constituent parts (2nd and 3rd group listed above) are called idiomatic compounds, in contrast to the first group known as non-idiomatic compounds.
