half mast en · NOUN
Meanings
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(alt-of, alternative, uncountable) Alternative form of half-mast.
alt of half-mast
Union flags will be flown at half mast on UK Government Buildings from today until 2000hrs 14 October.
2016 October 13, Department for Culture, Media & Sport and Foreign & Commonwealth Office, "Flag-flying from UK government buildings for the death of the King Bhumibol Adulyadej of Thailand", GOV.UK, Government Digital Service