抓住

catch on───理解，明白；变得流行

notch down───削减

ratchet down───降低；变低

back down───放弃；让步

call down───祈求到；责骂；招致

calm down───平静下来；镇定下来

came down───下来，降落；流传下来；倒塌；落魄，失势

I reach out and catch a spin-down green leaves are still green dip dip green, its surface is also suffused with green sheen.───我伸出手接住一片旋转而下的绿树叶，仍然是蘸绿蘸绿的，它的面上还泛着绿油油的光泽。

After running to the bus stop we sat down to catch our breath.───我们跑到汽车站后才坐下来喘口气。