posse
/ˈpɒsɪ/noun
1- US historical a body of men summoned by a sheriff to enforce the law〈美, 史〉临时执法队。
1.1
- （亦作posse comitatus /ˌkɒmɪˈteɪtəs/）Brit. historical the body of men above the age of fifteen in a county (excluding peers, the clergy, or the infirm), whom the sheriff could summon to repress a riot or for other purposes〈英, 史〉郡武装队。
- ORIGIN: comitatus from medieval Latin, 'of the county'.
1.2
- informal a group of people who have a common characteristic, occupation, or purpose〈非正式〉一群, 一组, 一队（有共同特点的人、同行或志同道合者）：
tea was handed round by a posse of mothers.
一群妈妈们给大家端来了茶水。
1.3
- informal a gang of black youths, especially Jamaicans, involved in (usually drug-related) crime〈非正式〉一帮黑人青年（尤指涉嫌贩毒的牙买加青年）。
1.4
- informal a group of people who socialize together, especially to go to clubs or raves〈非正式〉社交群体（尤指上夜总会或狂欢会的群体）。
词源
mid 17th cent.: from medieval Latin, literally 'power', from Latin posse 'be able'.