know which is which

verb

Roget 465: discriminate, distinguish, severalize^†; recognize, match, identify; separate; draw the line, sift; separate the chaff from the wheat, winnow the chaff from the wheat; separate the men from the boys; split hairs, draw a fine line, nitpick, quibble.    estimate etc. (measure) 466; know which is which, know what is what, know 'a hawk from a handsaw'" [Hamlet]. take into account, take into consideration; give due weight to, allow due weight to; weigh carefully.    ... show more

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