milk the bull: 做徒劳无功的事，缘木求鱼
susan tried everything to train her daughter into a lady, but it seems that she is milking the bull.
苏姗千方百计想把她女儿训练成个淑女，可这些似乎都是徒劳。
as dumb as an ox沉默不语
he was as dumb as an ox in the meeting. 开会时他沉默不语。
play the giddy ox：胡闹，干蠢事
don’t you play the giddy ox with me！你们别跟我耍赖撒疯!
throw /shoot the bull：吹牛，夸张
he likes to throw the bull. 他喜欢吹牛