To be able to discern or distinguish two or more people or things that appear or seem similar. This one is real, and this one is the counterfeit—you can tell them apart by the small holographic mark at the top corner of the genuine document.Even our parents sometimes have trouble telling me and my brother apart.See also: apart, tell
Discern or distinguish, as in It's hard to tell the twins apart. [First half of 1900s] See also: apart, tell
v. To perceive something as being different or distinct from something else: I couldn't tell apart the real $20 bill from the counterfeit one. The twins were identical, and we couldn't tell them apart.
See also: apart, tellSee also: