in a lower place than something
The cat hid under the bed.
covered by something
The treasure was buried under the sand.
less than a number or amount
Children under five get in free.
affected by something
The bridge broke under the heavy weight.
controlled by someone
The team worked under a new manager.
according to a rule or agreement
Under the rules, you must wear a helmet.
being examined or studied
The plan is under review by the committee.
using a different name
He wrote under a pen name.
in a particular section or category
Look under 'sports' in the index.
in a lower place
The dog went under to get out of the rain.
below water
The submarine went under to avoid detection.
less than
Tickets are ten dollars or under.
into sleep or unconsciousness
The patient went under for surgery.
lower or bottom
Check the under side of the car for damage.