1.b> (; ), ; ; , ; , ; the rope holding the raft suddenly tightened and broke , , ; to tighten a hatch ; to tighten a nut ; to tighten a cable / ; to tighten a knot / ; the screw wasn't properly tightened ; to tighten one's grip on smb.'s arm / ;
2.b> (; ); to tighten security ;
tob> tighten upb> (; ); ; to tighten up a law ; laws on DUI have tightened up recently ; the police are tightening up on this offence ;
to tighten one's beltb> " ", , .