一、词义：
go down
下降，下跌； 沉没； 屈服； 被记下；弯腰，跪下；失败；被咽下去；载入（历史），流传下去
go under
沉没；失败；破产；屈服
二、词汇搭配：
go down with 被接受
go down the drain 白白地被浪费掉
go down like a lead balloon 毫无效果
go down the tubes 完蛋
go down to 一直到
get down go back to grass roots 追根究底
go down 下降，下跌
down and to go 完成(多少)未完成
go down in the world 潦倒
go down to history 载入史册
go down like a ninepin 猛然倒下
go down the wrong way 进入气管
go under the knife 动手术
go under 沉没
go under the title of 被人称作…,以…之名...
go under the hammer 被拍卖
扩展资料：
一、例句：
1、The grain crop has gone down this year.
今年的粮食作物产量下降了。
2、His name will go down in the annals.
他的名字将载入编年史。
3、Hundreds died when the liner went down.
班轮沉没时，有数百人罹难。
4、Are you going to take the challenge lying down?
你打算屈服于这种挑战吗？
5、Tom did not knuckle down under the attacks.
面对这些攻击，汤姆并没有屈服。
6、The ship struck upon a rock and soon went under.
这只船撞到一岩石而很快沉没了。
7、He failed in doing business and went under.
他做生意失败而告破产。
二、近义词：
sink 下沉 ；lapse 过失 ；flop 啪嗒啪嗒地动... ；go under 沉没
wane 衰落 ；decline 下降 ；descend 下降 ；come down 下降，落下，（价格等）跌...
fall 落下 ；settle 解决 ；crash 撞击 ；set 放置
go down 下降，下跌 settle 解决
go by (时间)过去，逝去，消逝...
sink 下沉
set放置