A gang sign.

Any distinguishing mark, such as a tattoo, that serves to identify a member of a particular gang

A body of men employed to force others into military or naval service.

(vulgar) An orgy, especially a sexual one. / (US, slang) A gang fight. / (US, slang) Protecting gang turf, especially when dealing drugs or other black market objects. / (informal, dated) A gang rape.

A group of convicts chained together to work outside the confines of a prison. / (cycling) A group of cyclists riding in a close-knit formation akin to a road race, normally for the purposes of training.

To force men into military or naval service. / To coerce somebody into doing something that they are reluctant to do.

A theatrical performance by members of Scouts and Guides

A small cask in which to bring water aboard ships or in which it is kept on deck.

A small and cohesive group of people (usually teenagers) who regularly seek to solve mysteries.

(transitive, idiomatic) To join together in a group in order to overpower someone else.