驷不及舌

Explanation: A word to say, Sima chase cars do not pull back. Analogy words out, can no longer be recovered. 　　Usage: The main predicate; as predicate; that Shuoyibuer 　　Source: Pre-Qin Confucian "Analects, XII": "Xihu! Master of the said gentleman also, Si less than the tongue." 　　Examples: SD State amount "recorded in cats with strange night Tan Three": "Even today off the mouth, ~, Yi He, and regret." Thesaurus:  Junziyiyan, horse take the lead, A word spoken is past recalling., Not light promise Antonym Group:   walk or proceed slowly (and keep others waiting), Life After days, footstep ado, unalterable (like rivers flowing through a land), Shanshan tardy arrival, help meet an urgent need, Qingyanguaxin, Those who are quick to promise are generally slow to perform.