the.com/scruple

The tiny internal lawyer that shows up right before you do something you'll regret.

means A nagging twinge of conscience or hesitation that makes you pause before doing something you suspect is wrong.

from From Latin 'scrupulus,' a sharp little stone — literally the diminutive of 'scrupus,' a rough pebble. The leap to conscience is wonderfully literal: Romans used it for the small, nagging feeling of a pebble stuck in your sandal, the kind of tiny irritant you can't quite ignore. Over time that physical discomfort became a metaphor for moral discomfort — the mental pebble that won't let you walk easy until you've dealt with it.

origin
latin scrupulus, a sharp little pebble in your shoe
old usage
once meant a unit of weight, 20 grains
synonym crew
qualm, compunction, conscience's annoying intern
plot twist
having none is called unscrupulous, and it shows
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