Definition of half mast noun from the Oxford Advanced Learner's Dictionary

 

half mast

 noun
noun
BrE
 
; NAmE
 
 
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Idioms
at half mast
 
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(of a flag) flown at the middle of the mast as a sign of respect for a person who has just died Flags were flown at half mast on the day of his funeral.
See the Oxford Advanced American Dictionary entry: half mast