Making laws
sine die
Adjournment without a day, ending a session of Congress with no scheduled return. Latin, pronounced roughly SY-nee DY-ee.
In full
An ordinary adjournment sets the next meeting time; adjournment sine die sets none, ending the session. It matters practically: bills not enacted stay alive across the two sessions of a Congress but die when the Congress itself ends, and the ten-day clock on bills sitting with the President interacts with sine die to create the pocket veto.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.