flap back meaning in Chinese

挥舞锥体后倾

The schooner trembled to her keel under the reverse ; but next moment , the other sails still drawing , the jib flapped back again , and hung idle
但紧接着，虽然别的帆还张着，船头的三角帆却又啪啦一声被风刮回，无力地垂下来。
The grindstone had a double handle , and , turning at it madly were two men , whose faces , as their long hair flapped back when the whirlings of the grindstone brought their faces up , were more horrible and cruel than the visages of the wildest savages in their most barbarous disguise
磨刀石有一对把手。两个男人疯狂地摇着。磨盘一转动他们便扬起脸，长发往后耷拉，那样子比涂得满面狰狞的最可怕的野蛮人还更恐怖，更残忍。