get the upper hand

Also found in: Idioms.
References in classic literature ?
It was at first mere instinct, but once I had it in my hands and found it fast, curiosity began to get the upper hand, and I determined I should have one look through the cabin window.
In these troubled and crazy times it is still important to remember that in dealings with business associates, honesty and fairness will always get you further than trying to get the upper hand.