[1] : WordNet (r) 2.0

lock up
     v 1: secure by locking; "lock up the house before you go on
          vacation"
     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 up,
         shut away
see also:
lock in lock away lock put away shut up shut away 

[2] : Moby Thesaurus II by Grady Ward, 1.0

72 moby thesaurus words for "lock up":
   bang, bar, barricade, batten, batten down, bolt, bolt in, bosom,
   bottle up, bury, button, button up, cache, cast in prison, choke,
   choke off, clap, clap in jail, clap up, close, close up, constrict,
   contain, contract, cover, deposit, embosom, fasten,
   file and forget, fold, fold up, gaol, hide away, hold captive,
   hold in captivity, hold prisoner, immure, imprison, incarcerate,
   intern, jail, jug, keep hidden, keep secret, key, latch, lock,
   lock in, lock out, occlude, padlock, plant, plumb, put away, seal,
   seal off, seal up, secrete, secure, shut, shut the door, shut up,
   slam, snap, squeeze shut, stash, store away, stow away, strangle,
   throw into jail, zip up, zipper

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html