Keep quiet or unseen (6)
(Other definitions for lie low that I've seen before include "take cover" , "Stay out of sight, hide horizontally?" , "Try to be inconspicuous" , "Keep one's head down" , "Go to ground" .)
(Other definitions for lie low that I've seen before include "take cover" , "Stay out of sight, hide horizontally?" , "Try to be inconspicuous" , "Keep one's head down" , "Go to ground" .)