obse - orga
- one eighty out
- one eyed jack
- one fat lady
- one fell swoop
- one finger salute
- one foot
- one for the road
- one hundred and one
- one hundred percent
- one in a million
- one L
- one legged
- one o'clock
- one of a kind
- one of his majesty's bad bargains
- one of these days
- one of those days
- one off the wrist
- one short
- one side
- one step ahead
- one step at a time
- one step forward, two steps back
- one under
- one up
- one way or another
- one's
- one's marbles
- one's self
- one's socks off
- one-armed
- one-armed bandit
- one-armed router
- one-banana problem
- one-child policy
- one-day cricket
- one-day international
- one-day match
- one-dimensional
- one-drop rule