You know what it looks like… but what is it called?
TAKE THE QUIZ“when one”
The following 2 entries include the term when one.
cross that bridge when one comes to it
idiom: to not worry about a possible problem until it actually happens
know something when one sees it/one
idiom: to be able to recognize or identify something immediately
Love words? Need even more definitions?
Merriam-Webster unabridged