Synonym: go by, go down, set, settle, sink. Similar words: underground, underground railroad, bounder, founder, flounder, rounders, cofounder, co-founder. Meaning: v. 1. go under, "The raft sank and its occupants drowned" 2. disappear beyond the horizon 3. be called; go by a certain name.
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1. The firm will go under unless business improves.
2. She'll have to go under anaesthetic for the operation.
3. Because I'm a bad swimmer, I often go under and swallow a lot of water.
4. Kelly was about to go under the knife when her surgeon stopped everything.
5. Ian Fleming's original unpublished notes are to go under the hammer at London auctioneers Sotheby's.
6. The charity will go under unless a generous donor can be found within the next few months.
7. More and more women are choosing to go under the knife to improve their appearance.
8. There is not enough headroom for buses to go under this bridge.
9. Go under it, I told myself.
10. The new machine-which is thought to go under the name Sport-Cruiser-throws that out of the window.
11. They will go under the hammer at the London auctioneers Spink on 17 May.
12. Hundreds of items go under the hammer to save a medieval manor.
13. So that and nearly 500 other lots will go under the hammer at Sotherbys tomorrow.
14. A recession causes many reliable creditworthy consumers to go under; how safe will new and existing scoring systems now be?
15. I have to go under the knife next week.
16. The waste paper basket can go under the table.
17. Warships are meant to go under fire.
18. I have witnessed many professional services companies go under because they signed a long-term lease on too much office space at the wrong rent –and then revenues collapsed.
19. Those round things are called tires, and they go under the car!
20. A private collection of her early paintings is expected to go under the hammer early next year.
21. Stroked a tom-cat under the chin and watched a steam train go under a bridge.
22. This is part of public law but tends to go under the name of constitutional law.
23. He followed that by posting large signs advising tourists not to go under the cataract because of the danger of falling rocks.
24. The weak fall, but the strong will remain and never go under! Anne Frank 
25. If you do waste time the chances are good that your debtor will go under and you will get nothing.
26. If spending levels did not escalate at this season then many businesses would go under.http://sentencedict.com/go under.html
27. The Czech government does not want to see lots of companies go under because of a new bankruptcy law.
28. Six towns, 123 villages, 14 Buddhist temples, more than 20 schools and a prison will go under the water.
29. But we do need the slave trade if we're not to go under.
30. These ugly billboards have to go ! These luxuries all had to go under the Khmer Rouge.
More similar words: underground, underground railroad, bounder, founder, flounder, rounders, cofounder, co-founder, underdeveloped countries, underhanded, under consideration, under, founded, wounded, rounded, sounded, bounded, sunder, grounded, undergo, blunder, maunder, underway, under way, thunder, launder, asunder, plunder, unbounded, unfounded.