lag

[1]	fall behind , linger , loiter , delay , straggle , trail , hang back , dally , dawdle , inch/poke along
[2]	diminish , decrease , slacken , abate , slow (down/up) , flag , wane , ebb , falter , fail , let up , fall (off/away) , ease (up) , lighten
[3]	dawdle , fall back , fall behind
[4]	imprison , incarcerate , immure , put behind bars , jail , jug , gaol , put away , remand