Present participle of chagrin; the act of causing someone embarrassment or disappointment.
Present participle form of 'chagrin,' using the standard '-ing' suffix. The double-n spelling represents a variant convention following the same pattern as 'chagrinned,' related to British English conventions.
English is wonderfully flexible with spelling variants—'chagrinning' with double-n is less common than 'chagrining' with one, yet both are technically valid, showing how even modern English hasn't fully standardized verb forms.
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