Meaning of “collocation” - Learner’s Dictionary

collocation

noun [ C ] uk us /ˌkɒləˈkeɪʃən/

B2 a word or phrase that sounds natural and correct when it is used with another word or phrase:

In the phrase 'a hard frost', 'hard' is a collocation of 'frost', and 'strong' would not sound natural.

the combination of words formed when two or more words are frequently used together in a way that sounds natural:

The phrase 'a hard frost' is a collocation.

(Definition of “collocation” from the Cambridge Learner’s Dictionary © Cambridge University Press)