the.com/nip in the bud

Kill the problem while it's still small enough to kill.

means To stop something undesirable at its very earliest stage, before it has a chance to grow or develop.

from A gardening image: to 'nip' a bud is to pinch or clip it off a plant before it can flower, literally cutting a stem short with fingers or shears. The phrase appears in English from the 1500s-1600s, often in the form 'nip in the bloom' or 'nip in the blade' before 'bud' became the standard version — all variations on the same horticultural idea of cutting off growth before it even starts.

origin
horticultural, about pinching off buds before bloom
common error
people say nip it in the butt
logic
prevention costs less than cure, always
timing
works only before momentum builds
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