He chucked his dream of becoming a professional athlete and turned to education.

chucked 是动词 chuck 的过去式，chuck 在口语中表示"放弃、丢弃"，带有随意或突然放弃的含义。chuck 的本义是"轻抛、扔"，引申为"抛弃（想法、计划等）"。