boot up verb4 •To start a computer using its bootstrap procedure. •To start, using its bootstrap procedure.It takes a couple of minutes for the computer to boot up. •To start a computer program or a recording of a movie, show or song.Then you should boot up your word processor. •(figurative) To start up, to bootstrap (any process, especially a business).They believe they now have enough capital to boot up and stay alive until sales revenue begins. formsbooted up · booting up · boots up