In a way that is broad, open, or generous; showing willingness to include many things or people.
From expansive (adjective, meaning open or broad) plus the adverb suffix '-ly' (meaning 'in the manner of'). The adjective expansive developed from expansion in the 17th century.
When someone speaks expansively, they're using grand gestures and big ideas—it's almost like their words are literally spreading outward to fill more space. This connects to how emotions themselves feel: joy tends to make people expansive and open, while fear makes them contract inward.
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