The story
From out- + speak. Cognate with Scots outspeak (“to declare, utter, speak out”), Dutch uitspreken (“to pronounce, outspeak”), German aussprechen (“to express, pronounce”).
Etymology from Wiktionary, CC BY-SA 4.0.
outspeak
Today it means: To surpass in speaking; say or express more than; signify or claim superiority to; be superior to in meaning or significance; speak louder than. Full definition →