a boat used in towing; spec. a small vessel built for towing others, a tug.

One who tracks or tows a vessel; a tower; also, a towing-vessel, a tugboat.

A small, stoutly built, and powerful steamer used to tow other vessels; a tug-boat.

a steam-boat specially constructed for towing vessels; †applied jocularly to a railway-engine.

A vessel that tows; a tug.

a tug which pushes a line of connected unpowered barges; cf. push-towing n. at push-, comb._form affix 2.