Half mast and Half-mast

Half-mast and half mast are semantically related. In some cases you can use "Half-mast" instead the phrase "Half mast" as a noun or a verb or an adjective or an adverb.

Half-mast noun - A position some distance below the top of a mast to which a flag is lowered in mourning or to signal distress.

Half mast and half-mast are semantically related. Sometimes you can replace phrase "Half mast" with "Half-mast", this phrases are similar.