In a single-acting engine, an elongated hollow piston, open at the end, in which the end of the connecting rod is pivoted. The piston rod, crosshead and stuffing box are thus dispensed with.

(idiomatic, slang) Corpulence of the buttocks.

Similar to or shaped like a trunk (either a tree trunk, an elephant's trunk or a boxy chest).

(US) An organised alternative to trick-or-treating where candy is given to children from cars in a parking lot.

(US) participating in a trunk or treat event as a child

An event in which vendors present merchandise directly to store personnel or customers at a retail location or other venue.

plural of trunk show

(plural only) Short-leg boxer briefs

plural of trunk piston

(chiefly US) Synonym of swimming trunks