空口无凭

空口无凭

Literally means:

an empty mouth finds no guarantee

Actually means:

a mere verbal statement has no binding orce

It literally means a mere verbal statement has no binding force. It figuratively refers to words with no sound supporting proof. It stresses that a statement should be based on sound proof.

单凭嘴说而没有什么东西作为凭据。形容无凭无据的空口白话。强调要有证据。