to drive or urge forward; press on; incite or constrain to action.
2.
to drive or cause to move onward; propel; impart motion to.
Origin: 1375–1425; late Middle English impellen < Latin impellere to strike against, set in motion (transitive), equivalent to im-im-1 + pellere to strike, move (something); akin to pulse1
Related forms
un·im·pelled, adjective
Can be confused:1. compel, impel (see synonym note at compel); 2. compelled, impelled.