which is whichidiom
Definition of which is which
—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?
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
- On Contractions of Multiple Words
- A Look at Uncommon Onomatopoeia
- Is Singular 'They' a Better Choice?