Staunch
/stˈɔntʃ/
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Definition
(adj) Not permitting water or some other liquid to escape or penetrate; watertight.
Sentence Examples
My great aunt was a staunch teetotaler.
In order to staunch the flow of blood, apply direct pressure to the wound.
CEFR Practice Quiz
He has always been a ____ defender of the environment, working hard to protect the local wetlands.