(informal) a group of people who are similar in some way, or who spend time together 一群，一队，一伙（有共同之处的人）
a little posse of helpers
一小伙帮忙的人
//…a posse of reporters…
一群记者
A posse of Marsh’s friends persuaded them that this was a bad idea.
马什的一群朋友劝他们说这是个馊主意。
(in the US in the past) a group of people who were brought together by a sheriff (= an officer of the law) in order to help him catch a criminal （美国旧时由县治安官调集、协助捉拿罪犯的）地方武装团队
(informal) a group of young men involved in crime connected with drugs （与毒品有关的）青年犯罪团伙