Collocations are actual words in habitual company. A word in a usual collocation stares you in the face just as it is. Colligations cannot be of word… - John Rupert Firth

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Collocations are actual words in habitual company. A word in a usual collocation stares you in the face just as it is. Colligations cannot be of words as such. Colligations of grammatical categories related in a grammatical structure do not necessarily follow word divisions or even sub-divisions of words.