one-man show

1 public performance by one person of dramatic or musical items normally requiring more performers 单人演出（通常应有合演者的戏剧或音乐节目）. 2 person doing by himself things that are usually done by several people 做通常需几人做的事情的人.

once a month, once and for all, once for all, once in a while, once more, once upon a time, oncologist, oncoming, one, one after another, one another, one day, one p (also 1p), one's bread is buttered, one's opposite number, one-, one-armed bandit, one-horse, one-liner, one-man band, one-night stand, one-off, one-sided, one-sidedly, one-sidedness, one-time, one-to-one, one-track mind, one-upmanship, one-way, onerous, oneself, ongoing, onion, online, onlooker, only, only that, only too, ono,