underbeat noun 1verb 1forms 3 noun1 •A beat that runs beneath a piece of music.It certainly had merit as a punkish shouter with its machine-gun-spatter underbeat. — 2013 verb1 •To beat too little, or less than usual.At high elevations above 3.000 feet: Raise the baking temperature about 25 degrees. Underbeat the eggs. — 1994 formsunderbeaten · underbeating · underbeats