noun
a mistake or error
verb
to make a mistake or error
adjective
having made a mistake or error
adverb
in a mistaken or erroneous manner
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The technician accidentally fouled up the wiring, causing a short circuit.
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I really hope I don't foul up the presentation tomorrow.
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Don't foul up this opportunity by being late.
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His decision to lie ended up fouling up his reputation.