upper hand
whip hand

Men always seemed to get the upper hand if you let them talk too long.

They had the upper hand at the start of play on the third day but you would never have thought so.

For some reason they always seem to get the upper hand.

With the strong, he had to have the upper hand.

Kind of made him feel he had the upper hand for once.

But when the time came for him to take her to bed, he would have the upper hand.

She wasn't going to let him have the upper hand.

The time is now, while we still have the upper hand.

We must never let them think they have the upper hand.

Just let them believe they had the upper hand, and on they'd come.