pro·pel 
(prə-pĕl)
(prə-pĕl)tr.v. pro·pelled, pro·pel·ling, pro·pels
1. To cause to move forward or onward. See Synonyms at push.
2. To cause to develop or progress: a misunderstanding that propels the story forward.
[Middle English propellen, from Latin prōpellere : prō-, forward; see PRO-1 + pellere, to drive; see pel-5 in the Appendix of Indo-European roots.]