Impelling p. pr. & vb. n. : of Impel

Example:
What impels butterflies to fly north when they weren't born here?

Taxonomy
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Defination from the web:
impelling in the Online Dictionary. Meaning of impelling. Pronunciation of impelling. Translations of impelling. impelling synonyms, impelling antonyms. ... Unerringly impelling this dead, impregnable, uninjurable wall, and this most buoyant thing within; there swims ...