adjective
COLLOCATIONS FROM OTHER ENTRIES
an unannounced visit (= one that someone makes without first telling the person that they are going to visit )
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The social worker made an unannounced visit.
arrive unannounced (= without anyone expecting or knowing you were coming )
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He arrived unannounced yesterday and stayed the night.
EXAMPLES FROM OTHER ENTRIES
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an unannounced visit
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Investigators from the health department made unannounced visits to the hospital in March.
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My brother is famous for showing up at our houses unannounced , usually around dinner time.