Source : WordNet®

shut up
     adj : closely confined [syn: {pent}, {shut up(p)}]
     v 1: refuse to talk or stop talking; fall silent; "The children
          shut up when their father approached" [syn: {close up},
          {clam up}, {dummy up}, {belt up}, {button up}, {be quiet},
           {keep mum}] [ant: {open up}]
     2: place in a place where something cannot be removed or
        someone cannot escape; "The parents locked her daughter up
        for the weekend"; "She locked her jewels in the safe"
        [syn: {lock in}, {lock away}, {lock}, {put away}, {shut
        away}, {lock up}]
     3: cause to be quiet or not talk; "Please silence the children
        in the church!" [syn: {hush}, {quieten}, {silence}, {still},
         {hush up}] [ant: {louden}]