one-step one-step procedure one-stop one-stop shop one-tenth one-third one-thousandth one-time one-time pad one-to-one
| one-track one-track mind one-trick pony one-trillionth one-two one-two-three (current term) one-two punch one-two punches one-twos one-up
| one-up-one-down one-up-one-downs one-uped one-upmanship one-way one-way light time one-way mirror one-way mirrors one-way street one-way ticket
|