the.com/upper hand

The advantage you claim first and define last, retroactively.

means To have the upper hand is to hold the position of advantage or control in a contest, negotiation, or struggle.

from The phrase comes from an old literal practice: in games and in deciding who'd go first (like climbing hand over hand up a bat or stick), whoever's hand landed on top at the end held the winning grip. By the 1500s 'upper hand' had climbed off the stick and into the language as a general term for dominance — the grip became a metaphor, and the metaphor outlived the game.

origin
From a kids game stacking hands on a bat
not physical
No actual hand or upperness required
paradox
Claiming it loudly usually means you lack it
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