Senses
是骡子是马，拉出来遛遛/ 是騾子是馬，拉出來遛遛 the proof is in the pudding
literally meaning "whether it is a mule or a horse, take it out for a walk"; used to express that the only way to judge someone's true ability or the quality of a thing is to put it to a practical test
References
No references for this word.