Etymology

compursion

com·purs·ion
C3O1M3P3U1R1S1I1O1N1

Today it means: A pursing, as of the lips. Full definition →

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The story

From com- (prefix meaning ‘together’) + purse (“to press (one’s lips) in and together so that they protrude”, verb) + -ion (suffix denoting an action or process, or condition or state).

Etymology from Wiktionary, CC BY-SA 4.0.