In a manner that expresses endorsement or approval; in a way that shows support.
From 'endorse' + '-ing' (present participle) + '-ly' (adverb suffix). This adverbial form allows speakers to describe actions performed with endorsement or approval.
When someone smiles endorsingly at you, their facial expression is saying 'yes, I approve' without words—the adverb captures that quality of showing support through action rather than declaration.
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