Source : WordNet®

lock in
     v 1: close with or as if with a tight seal; "This vacuum pack
          locks in the flavor!" [syn: {seal in}]
     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 away}, {lock}, {put away}, {shut up}, {shut
        away}, {lock up}]