n.
Function: transitive verb
Date: 1750
1 a archaic : 1 BUTT b : OPPOSE , RESIST < buck ing the system>
2 : to throw (as a rider) by bucking
3 : to charge into (as a headwind)
4 a : to pass especially from one person to another b : to move or load (as heavy objects) especially with mechanical equipment
intransitive verb
1 of a horse or mule : to spring into the air with the back arched
2 : to charge against something (as an obstruction)
3 a : to move or react jerkily b : to refuse assent : BALK
4 : to strive for advancement sometimes without regard to ethical behavior < buck ing for a promotion>
– buck · er noun