Tra từ under - Từ điển Oxford Advanced Learner 8th

under preposition, adverb, adjective BrE [ˈʌndə(r)] NAmE [ˈʌndər]
preposition
1. in, to or through a position that is below sth
• Have you looked under the bed?
• She placed the ladder under (= just lower than) the window.
•The dog squeezed under the gate and ran into the road.
2. below the surface of sth; covered by sth
• The boat lay under several feet of water.
3. less than; younger than
•an annual income of under £10 000
• It took us under an hour.
• Nobody under 18 is allowed to buy alcohol.
4. used to say who or what controls, governs or manages sb/sth
• The country is now under martial law.
• The coinage was reformed under Elizabeth I (= when she was queen).
•She has a staff of 19 working under her.
•Under its new conductor, the orchestra has established an international reputation.
5. according to an agreement, a law or a system
• Six suspects are being held under the Prevention of Terrorism Act.
• Under the terms of the lease you had no right to sublet the property.
•Is the television still under guarantee?
6. experiencing a particular process
• The hotel is still under construction.
• The matter is under investigation.
7. affected by sth
• The wall collapsed under the strain.
• I've been feeling under stress lately.
•I'm under no illusions about what hard work this will be.
•You'll be under anaesthetic, so you won't feel a thing.
8. using a particular name
•She also writes under the pseudonym of Barbara Vine.
9. found in a particular part of a book, list, etc
• If it's not under ‘sports’, try looking under ‘games’.

Word Origin:
Old English, of Germanic origin; related to Dutch onder and German unter.

adverb
1. below sth
• He pulled up the covers and crawled under.
2. below the surface of water
• She took a deep breath and stayed under for more than a minute.
• The boat was going under fast.
3. less; younger
•prices of ten dollars and under
•children aged 12 and under
4. in or into an unconscious state
•He felt himself going under.

Word Origin:
Old English, of Germanic origin; related to Dutch onder and German unter.

adjective only before noun
lower; underneath
•the under layer
•the under surface of a leaf

Word Origin:
[under] Old English, of Germanic origin; related to Dutch onder and German unter.