WordNet (r) 3.0 (2006):

lie low
    v 1: keep a low profile, try to be inconspicuous
    2: to try to avoid detection especially by police; "After we
       knock off that liquor store we'll have to lay low for a
       while"

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "lie low":
   be incognito, be latent, beware, burrow, couch, crawl, crouch,
   disappear, drop from sight, escape notice, go into hiding,
   go to ground, go underground, grovel, have a care, hibernate, hide,
   hide away, hide out, hole up, hug the earth, lie, lie beneath,
   lie close, lie doggo, lie dormant, lie hid, lie prone,
   lie prostrate, lie snug, lie under, look about one, look out,
   look sharp, lurk, make no sign, masquerade, mind, play peekaboo,
   qui vive, remain anonymous, retire from sight, sit tight, smolder,
   squat, stay in hiding, take care, take cover, take heed, underlie,
   watch out, wear a mask