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idiom

GENERAL: Fixed combination of elements with an idiosyncratic, not (completely) compositional meaning, such as kick the bucket, spill the beans. Idioms are generally inaccessible for syntactic and/or semantic variation: sentence (ii) cannot mean that some people died last week.

(i)    He kicked the bucket last week
(ii) * Some buckets were kicked last week

Nevertheless, elements of idioms may sometimes be moved (as in (iii)) or modified (as in (iv)).

(iii)  advantage_i was taken t_i of Bill
(iv)   he kicked the proverbial bucket