'Collocation' is the tendency of some words to meet in word groups. Some words are 'highly collocated', like 'blue skies', 'green grass', and 'wrinkled old men'-- the words in each group occur together frequently. Other words have 'low collocation', like 'green skies', 'red grass', and 'wrinkled young debutantes', which seldom form word groups.
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