0 in or to a position below or lower than something else, often so that one thing covers the other:
In AD 79 the city of Pompei was buried under a layer of ash seven metres deep.
She put the thermometer under my tongue.
She was holding a folder under her arm (= between her upper arm and the side of her body).
They stood under a tree (= below its branches) to avoid getting wet.
Books on Ansel Adams will probably be under Art or Photography.
Custard? That comes under Desserts.
1 less than:
2 happening during, as a result of, or according to a particular situation, event, rule, etc.:
The work was completed under very difficult conditions.
Now that the deadline is approaching we all feel under pressure.
The chair broke under his weight (= because he was too heavy for it).
Under the current rules, you need the agreement of at least 6 out of 10 committee members.
The proposals are now under consideration by the Board of Governors.
She'll have to go under anaesthetic for the operation.
old-fashioned She's been under the doctor for a viral infection.
3 controlled or governed by a particular person, organization, or force:
He's a Colonel, with hundreds of soldiers under him (= obeying his orders).
I wonder what Britain was like under the Romans (= during the time when the Romans controlled Britain).
People born under (= during the period of) the zodiac sign Pisces are supposed to be dreamy and artistic.
He's under doctor's orders (= has been told by a doctor) to cut down on fatty food and to drink no alcohol for at least six months.
4 using a particular name, especially one that is not your real name:
5 below the surface of something:
6 not enough or not done as well or as much as is necessary:
We're all overworked and underpaid.
His boss says he's under-performing (= not doing as well as he should) at work.
an underpass
7 in or to a position below or lower than (something else), often so that one thing covers the other:
8 less than:
9 in the process of, influenced or controlled by, or according to:
Construction had to be done under difficult conditions.
Under current law, stores in this town can’t do business on Sunday.
We liked working under her because she made us feel appreciated.
"Where can I find books on swimming?" "Look under sports (= within the subject of sports)."
We seemed to be under attack (= in the process of being attacked) by a swarm of bees.
Your request for a transfer to our Denver office is under consideration (= being considered).
I was under the impression (= I believed) that she was married.
I find it difficult to work under pressure (= with this influence).
10 less than something else:
11 below or lower than something else:
Several lifeguards tried desperately to reach him before he went under (= sank below the surface of the water).
12 not enough:
The potatoes were undercooked.
Classes were too large because the school was understaffed.
The children squealed in delight when they saw all the presents under the Christmas tree.
There was no soap, so I just quickly rinsed my hands under the tap.
You can get travel concessions if you are under 26.
It's against the law to leave children under a certain age alone in the house.
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