which is which

phrase

—used to say that one is unsure about the identity of each member of a group

One of the twins is named John and the other William, but I don't know which is which?

Browse Nearby Words

which is to say

which is which

whichsoever

See all Nearby Words

Cite this Entry

Style

“Which is which.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/which%20is%20which. Accessed 5 Mar. 2026.

Copy Citation

Popular in Grammar & Usage

More Words You Always Have to Look Up

5 Verbal Slip Ups and Language Mistakes

Is it 'nerve-racking' or 'nerve-wracking'?

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

which is which

phrase

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

deem

Popular in Grammar & Usage

More Words You Always Have to Look Up

5 Verbal Slip Ups and Language Mistakes

Is it 'nerve-racking' or 'nerve-wracking'?

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

Why do we say 'make a beeline'?

Why do we call it a 'flea market'?

17 Words for Dog Breeds

Birds Say the Darndest Things

Even More Bird Names that Sound Like Insults (and Sometimes Are)

Popular

More Words You Always Have to Look Up

Why do we say 'make a beeline'?

Why do we call it a 'flea market'?

Games & Quizzes