Put a coward to his mettle, and he'll fight the deil.
"A baited cat is as fierce as a lion."—English.
Put anither man's bairn in your bosom, and he'll creep oot at your sleeve.
"That is, cherish or love him, he'll never be naturally affected towards you."—Ray.
Put nae force against the flail.
Put on your spurs and be at your speed.
Put twa pennies in a purse, and they'll creep thegither.
Put your finger in the fire, and say it was your fortune.
Spoken of a person who has wittingly placed himself in difficulties, and who attributes his bad position to fortune.