防患未然 [ㄈㄤˊ ㄏㄨㄢˋ ㄨㄟˋ ㄖㄢˊ; fang2 huan4 wei4 ran2] to prevent troubles before the event (idiom); to forestall to nip sth in the bud prevention (is better than cure) ◄ ►