with obj.
1- beat (a person or animal) repeatedly and violently with a stick or whip棒打; 鞭打：
she thrashed him across the head and shoulders
她抽打他的头和肩
as noun thrashing what he needs is a good thrashing.他需要的是一顿狠狠的棒揍。
1.1
- hit (something) hard and repeatedly连续重击：
the wind screeched and the mast thrashed the deck.
风咆哮着, 桅杆不断地击打着甲板。
1.2
- no obj. make a repeated crashing by or as if by hitting something连续拍击; 痛打：
the surf thrashed and thundered.
惊涛拍岸发出雷鸣般的吼声。
1.3
- no obj. move in a violent and convulsive way剧烈扭动, 猛烈晃动, 翻来覆去：
he lay on the ground thrashing around in pain
他躺在地上疼得不断打滚
with obj. she thrashed her arms, attempting to swim.她奋力摆动双臂, 尝试着游起来。
1.4
- no obj.
thrash around
struggle in a wild or desperate way to do something奋力拼搏, 拼命挣扎： two months of thrashing around on my own have produced nothing.
我自己折腾了两个月结果一事无成。
1.5
- informal defeat (someone) heavily in a contest or match〈非正式〉（比赛中）彻底击败, 重创：
I thrashed Pete at cards
牌桌上皮特被我打得落花流水
with obj. and complement Newcastle were thrashed 8-1 by the Czech team.纽卡斯尔队以1比8的大比分落败于捷克队。
1.6
- no obj., with adverbial of direction move with brute determination or violent movements奋力前进：
I wrench the steering wheel back and thrash on up the hill.
我把方向盘猛往回拽, 奋力开上了山。
1
- usu. in sing. a violent or noisy movement, typically involving hitting something repeatedly剧烈扭动, 抽动; 打, 击（尤指连续拍打）：
the thrash of the waves.
波涛拍击。
1.1
- Brit. informal a party, especially a loud or lavish one〈英, 非正式〉（尤指喧闹或浪费的）聚会。
1.2
- informal a fast and exciting motor race or other sporting event〈非正式〉激烈的汽车赛（或其他体育赛事）。
2
- （亦作thrash metal）[mass noun] a style of fast, loud, harsh-sounding rock music, combining elements of punk and heavy metal鞭击金属, 激流金属（融合了重金属乐和朋克音乐的快节奏、吵闹刺耳的摇滚乐）。
2.1
- count noun a short, fast, loud piece or passage of rock music鞭击（或激流）金属乐曲。
词源
Old English， variant of THRESH (an early sense). Current senses of the noun date from the mid 19th cent.
短语动词
thrash something out
1
- discuss something thoroughly and honestly反复（或彻底）讨论。
1.1
- produce a conclusion by such discussion通过反复讨论得出结论; 通过彻底讨论解决问题。