Idiom Definition:
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"to nip it in the bud"
to stop something when it is small - before it becomes a big problem
Synonyms:
advanced, anticipate, anticipatory, before, beforehand, early, immediate, preceding, precipitant, prompt, pronto, punctual, quick, seasonable, soon, speedy
Literally, this picture shows the bud of a plant. If we nip the bud (cut off the bud), then the plant will not grow.