pop-up buoy

pick-up up hay baler

marker buoy [= marine buoy

boot-up speeding up

half built up crank shaft [= semi-built-up crank shaft

Hold Up And Stop Up Rotating

on the up-and-up

put up or shut up

sequence of train breaking up and making up

up-and-up

up-supply and up-discharge

up-supply and up-exhaust

WARM UP; WARMING UP

acetylene buoy

acoustic buoy

aeronautical anchorage buoy

aid to navigation buoy

air-deployable buoy

anchor buoy