Р-37

СЕМЬ РАЗ ПРИМЕРЬ (ОТМЁРЬ), (А) ОДИН (РАЗ) ОТРЕЖЬ (saying) before you do or decide sth. important, think it over carefully, plan well, take all the necessary precautions etc (because once sth. is done there is no undoing it): - look before you leap better (itis better to be) safe than sorry.