propel (v.)

mid-15c., "to drive away, expel," from Latin propellere "push forward, drive forward, drive forth; move, impel," from pro "forward" (see pro-) + pellere "to push, drive" (from PIE root *pel- (5) "to thrust, strike, drive"). Meaning "to drive onward, cause to move forward" is from 1650s. Related: Propelled; propelling.