Making laws
pocket veto
If Congress adjourns during the President's 10-day window so the bill cannot be returned, presidential inaction kills it instead of enacting it, and there is nothing to override.
In full
Normally a bill the President ignores for ten days becomes law. But if Congress has adjourned and thereby 'prevented its return', the unsigned bill dies instead. Because no veto message is returned, Congress has nothing to override; its only remedy is to pass the bill again in a new session.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.