Definition from macmillandictionary.com
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The troops prepared to withstand a long siege.
An attempt was made to break the 38-month siege of Sarajevo.
The king lifted the siege two months later.
Malta was under siege in World War II.
Police surrounded the house for a 12 hour siege.
The town was in a state of siege (=people could not leave or enter it).
Hundreds of students laid siege to the American embassy.