preposition: in a lower place or position than; below
The cat slept under the table.
preposition: at a lower level, layer, or grade than
She has three people under her in the company hierarchy.
preposition: less than (a specified amount, age, or price)
Children under 12 get in for free.
preposition: according to the rules or authority of
The project was completed under the new manager's direction.
preposition: in a state of being subjected to a particular condition or process
The bridge is under construction.
adverb: in or into a state of unconsciousness
The anesthetic put the patient under for the surgery.
