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: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.