"Stepped on " sounds accidental, but it is effective. ) "Crushed" is OK. Informally: I smashed the bug.
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AlpheccaStars"trampled" is used for grass or vegetation (It does not kill.)Actually, I believe that trampled is used in cases like "the runner was trampled to death during the running of the bulls". It does, however, imply a larger scale (either by weight or by number), and certainly wouldn't be used in the instance proposed by the original