B2 [C] (_ALSO collocate) a word or phrase that is often used with another word or phrase, in a way that sounds correct to people who have spoken the language all their lives, but might not be expected from the meaning:

B2 [C] the combination of words formed when two or more words are often used together in a way that sounds correct:

F0 [U] the regular use of some words and phrases with others, especially in a way that is difficult to guess