Old English bat "boat, ship, vessel," from Proto-Germanic *bait- (cf. Old Norse batr, Dutch boot, German Boot), possibly from PIE root *bheid- "to split" (see fissure), with the sense of making a boat by hollowing out a tree trunk; or it may be an extension of the name for some part of a ship. French bateau "boat" is from Old English or Norse. Spanish batel, Italian battello, Medieval Latin batellus likewise probably are from Germanic.
the gravy train, lifeboat, man in the boat, miss the boat, on the gravy train, ride the gravy train, rock the boat