You know what it looks like… but what is it called?
TAKE THE QUIZ“on one”
The following 3 entries include the term on one.
one-on-one
adjective or adverb: playing directly against a single opposing player
on one condition
idiom: only upon doing or accepting one (specified) thing
on one pretext or another
idiom: using various reasons to hide the real reason for doing something
Love words? Need even more definitions?
Merriam-Webster unabridged