"bucking" in the verb sense

1. buck

to strive with determination

"John is bucking for a promotion"

2. buck, go against

resist

"buck the trend"

3. tear, shoot, shoot down, charge, buck

move quickly and violently

"The car tore down the street"

"He came charging into my office"

4. buck, jerk, hitch

jump vertically, with legs stiff and back arched

"the yung filly bucked"

Source: WordNet® (An amazing lexical database of English)

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