be down and out:疲惫不堪，一蹶不振
EX: After about ten years of no business at all, they are practically down and out.
EX: I don't think you realize that I am down and out.
EX: Sometimes it's more fun to go on a double date.
go off the deep end:鲁莽行事，感情用事
EX: He surely went off the deep end when he bought that restaurant.
go the whole hog:全力以赴
EX: When Bob became interested in model airplanes, he went the whole hog.
jump out of the frying pan into fire:每况愈下(from bad to worse)
EX: You're jumping out of the frying pan into the fire. By trying to straighten out with Mr.Bagnell, you're getting your self in trouble with Mrs. Bagnell.
jump down one's throat:横加指责
EX: I don't mind being corrected when I am wrong, but you don't need to jump down my throat.
lick into shape:塑造，训练整顿
EX: Two years in the army will lick him into shape.
EX: The inspection was announced at two o'clock, and they had the place licked into shape.
look down one's nose at:嗤之以鼻，瞧不起
EX:The man is a snob. He looks down his nose at most people
EX:He looks down his nose at the offer. (meaning he doesn't care about the offer.)
make heavy weather:发觉某事有困难
EX:Though the investment is at present making heavy weather, the future is regarded withconfidence.
make head or tail of: 弄清楚，懂得
EX:Can you understand this letter? I've read it through twice and I juse can't make head of tail of it.
Stand to reason 清楚而且合乎逻辑
Ex:It stands to reason that too many shopping choices can be as bad as too few.
Ex:If you drink too much coffee a day, it stands to reason that your health will suffer.
kick around 私下讨论一下
Ex: We haven't decided where to go on vacation. I think we'd better kick it around for a while.
put two and two together 找出解决之道
Ex: At first, he couldn't understand the directions for assembling the bookcase, but later on he was able to put two ond two together.