欲擒故縱
leave sb at large the better to a pprehend him;give sb enough line or rope;play cat and mouse with sb;allow sb more latitude first to keep a tighter rein on him afterwards
欲擒故縱yù qín ɡù zònɡ
擒：捉拿；故：故意；縱：放縱。形容想要捉拿他，故意先放松一下，以便更好地控制。leave sb. at large the better to apprehend him, play cat and mouse with, let the enemy loose in order to catch him later