Senses
是骡子是马，牵出来遛遛/ 是騾子是馬，牽出來遛遛 the proof is in the pudding
literally meaning "to see whether it is a mule or a horse, take it out for a walk"; used to mean that a person's true ability or the quality of a thing can only be judged through a practical test
References
No references for this word.