Supporting, approving, or permitting; the present participle of countenance, meaning the ongoing act of giving tacit approval or consent.
From 'countenance' plus the '-ing' suffix (present participle), creating a verb form that describes the active process of approving or allowing something.
There's a subtle legal or moral undertone to 'countenancing'—it implies you're not necessarily endorsing something loudly, but you're failing to prevent it, which can make you complicit!
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