the.com/counterbalance

The weight you add so nothing tips over, including arguments and elevators.

means A force, weight, or influence that offsets another, keeping something stable instead of letting it tip over or run away with itself.

from Built from the Latin-rooted 'counter-' (against, opposite) plus 'balance,' from Latin 'bilanx' — 'bi-' (two) and 'lanx' (scale-pan) — literally 'having two scale-pans,' the image of an old weighing scale. Put them together and you get a word that's literally 'a weight on the opposite scale-pan,' pressed into figurative service for anything from political power to emotional steadiness.

origin
literally balance against, from 17th century French
engineering
elevators use one to cut motor effort by half
politics use
checks and balances is this idea in a suit
body hack
your arms swing opposite legs to stop you spinning
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