In an upright, vertical, or dignified manner; with the body or posture held straight and tall.
From 'erect' plus the adverbial suffix '-ly,' which transforms adjectives into adverbs describing the manner of an action. Standard adverbial formation in English.
When someone 'stands erectly,' they're not just vertical—there's an implied dignity and alertness, showing how a simple posture word carries social meaning in English.
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