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Although words can appear as single items which are
combined in a sentence, they can also occur in two-or-more
item groups. They often combine with each other in ways which
competent speakers of the language recognize instantly.
Word combinations (also known as collocations) have
become a subject of great interest in the recent past.
Collocation is the way in which words co-occur – combinations
which, through custom and practice, have become to be seen
as normal and acceptable. It is immediately apparent that some
words can live together, others cannot. We say fast asleep, and
this is an acceptable collocation, but fast awake is not.
The chunking of language suggests that talking about
vocabulary exclusively in terms of words is not sufficient
to account for the different kinds of meaning unit that the
language has at its disposal.