tell which is which

To be able to identify or distinguish two similar or identical people or things. Tom and his twin always dress so similarly, so I never can tell which is which. I know that the two formats look very much alike, but you really ought to be able to tell which is which by this point.

See also: tell

See also:

know which is which
which is which
tell things apart
tell (someone or something) apart
tell apart
tell people or things apart
keep (two or more people) straight (in one's mind/head)
keep people straight
tell the difference between
tell the difference between (someone or something)

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