half-mast
From Longman Dictionary of Contemporary Englishhalf-mastˌhalf-ˈmast noun → at half-mastExamples from the Corpushalf-mast• Jerry's eyelids are at half-mast.• For instance, a flag at half-mast is a symbol of grief, whereas tears are a sign of grief.• Flags at half-mast, commemorative wreaths, speeches and Solemn music marked the day.• The flags were flying at half-mast.• He wore a short-sleeved dress shirt with the collar open and his necktie at half-mast.