what is the meaning of this idiom

Hai…i just want know, what is the meaning of this idiom

“hold ur horses???”

hopefully u can help me..Thank You 

“Hold your horses” is a common idiom to mean “hold on” or wait,

Example, i’m going outside and im asking my sister if she is ready ,(she is not) ,she will answer “hold ur horses”,which means she is asking me to wait 

I hope it’s clear now :)

ooooo..i c…very clear to me… tq ya… :)