number two
noun
informal <非正式>
1
- a second in command第二号人物, 二把手：
he is currently number two at the Department of Employment.
他现在是招聘部的二把手。
1.1
- a person or thing ranked second in ability or size排名第二的人（或物）。
2
- used euphemistically to refer to faeces〈婉〉粪便。