Collocation is a type of formulaic language. Formulaic language consists of fixed expressions that you learn and understand as units rather than as individual words.
Collocation means a natural combination of words.
Collocation is a pair or a group of words that are often used together.
Collocation is a verb that consists of a verb and a particle or a verb and two particles.
Compound, idioms and collocation
Idiom, collocation and compound
Collocation, idiom and compound