French saquebute, Old French saqueboute a sackbut, earlier, a sort of hook attached to the end of a lance used by foot soldiers to unhorse cavalrymen; properly, proper meaning, pull and push; from saquier, sachier, to pull, draw (perhaps originally, to put into a bag or take out from a bag; see Sack a bag) + bouter to push (see Butt to thrust). The name was given to the musical instrument from its being lengthened and shortened.
  • (Music) A brass wind instrument, like a bass trumpet, so contrived that it can be lengthened or shortened according to the tone required; — said to be the same as the trombone.
    [Written also sagbut.] Moore (Encyclopedia of Music).
    ☞ The sackbut of the Scriptures is supposed to have been a stringed instrument.