"His knees buckled"
"The highway buckled during the heat wave"
I'd better buckle down to those reports.
我最好認真靜下來努力完成那些報告。
Would..interrupt you just when you were buckling with your labours.
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)