It behooves us to be prepared. We will begin a series of atomic bomb drills ... / Becomes necessary, Mr. Hupfer, said Mrs. Baker, as in 'It behooves us to raise our hands before we ask a question..
[ bi-'hüf ] (noun.) before 12th century. Middle English behof, from Old English behOf profit, need; akin to Old English hebban to raise; more at HEAVE.