look before you leap
US /lʊk bɪˈfɔr ju lip/
UK /lʊk bɪˈfɔr ju lip/

1.
三思而後行, 謀定而後動
think carefully about what you are going to do before you do it, because once it is done, you cannot change it
:
•
It's always wise to look before you leap when making big decisions.
做重大決定時,總是會三思而後行。
•
Don't just quit your job without a plan; look before you leap.
不要沒有計劃就辭職;要三思而後行。