1. past tense of buck; jumped or moved suddenly and violently, especially of a horse trying to throw off a rider
2. past tense of buck; resisted or opposed something strongly
3. past tense of buck; moved or pushed against something with force

Examples

• The wild horse bucked violently when the cowboy tried to mount it.
• She bucked against the unfair rules imposed by the committee.
• The bronco bucked and kicked in the rodeo arena.
• He bucked the trend by choosing a different career path.
• The boat bucked against the strong current.
• The students bucked the administration’s new dress code policy.