greatcoat
US /ˈɡreɪt.koʊt/
UK /ˈɡreɪt.koʊt/

1.
a heavy overcoat, typically with a cape or deep collar, worn especially by soldiers or travelers.
:
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He wore a thick greatcoat to protect himself from the biting wind.
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The soldier adjusted his greatcoat before heading out into the snow.