buckle down片語動詞KK [ˋbʌkəl daʊn] /ˈbʌkəl daʊn/發音片語動詞1認真投入、全力以赴、專心用功口語If you buckle down now, you can finish the report by Friday.如果你現在認真投入,週五前就能把報告寫完。