expression

on the horn: Idiom Meaning and Origin

on the go: Idiom Meaning and Origin

on the fly: Idiom Meaning and Origin

on the face of: Idiom Meaning and Origin

on tenterhooks: Idiom Meaning and Origin

on ice: Idiom Meaning and Origin

one step forward, two steps back: Idiom Meaning and Origin

one step ahead: Idiom Meaning and Origin

one’s socks off: Idiom Meaning and Origin

one’s name is mud: Idiom Meaning and Origin

onesie-twosie: Idiom Meaning and Origin

one’s blood is up: Idiom Meaning and Origin