Having six sides.

(ice hockey) The six oldest National Hockey League franchises still in existence (Blackhawks, Bruins, Canadiens, Maple Leafs, Rangers and Red Wings)

(soccer) A match between two teams on a similar number of points (in a league using the three points for a win system), such that the difference between a side winning and losing the match is a six-point swing relative to their opponents.

simple past tense and past participle of deep-six

(colloquial, dated) A revolver which holds six cartridges.

(of a numerical amount, chiefly annual income) Counted in the hundreds of thousands; 100,000 to 999,999.

(rail transport, colloquial) the area between the closest rails of two parallel standard gauge railway lines, regardless of the actual distance.

(idiomatic) To discard, get rid of, or cancel; to completely put an end to something.

Ejection, discardment or destruction. / The grave or death; also, the (notional) place where something is discarded.

(Ireland, informal) The six Irish counties that form Northern Ireland.