(~s)
A ~ is a period of time when people remain quietly in a place, especially at night, for example because they are praying or are making a political protest.
Protesters are holding a twenty-four hour ~ outside the socialist party headquarters.
N-COUNT
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If someone keeps a ~ or keeps ~ somewhere, they remain there quietly for a period of time, especially at night, for example because they are praying or are making a political protest.
She kept a ~ at Patrick’s bedside.
PHRASE: V inflects, usu PHR prep/adv