phrase

on the wane: Idiom Meaning and Origin

on the skids: Idiom Meaning and Origin

on the point of: Idiom Meaning and Origin

on the horn: Idiom Meaning and Origin

on the go: Idiom Meaning and Origin

on the fly: Idiom Meaning and Origin

on ice: Idiom Meaning and Origin

one step ahead: Idiom Meaning and Origin

one’s lips are sealed: Idiom Meaning and Origin

onesie-twosie: Idiom Meaning and Origin

on course: Idiom Meaning and Origin

once in a while: Idiom Meaning and Origin