Under definition

(1) Located below or beneath something else

"Nether garments"

"The under parts of a machine"

(2) Further down

"See under for further discussion"

(3) Down below

"Get under quickly!"

(4) Below the horizon

"The sun went under"

(5) Below some quantity or limit

"Fifty dollars or under"

(6) In or into a state of subordination or subjugation

"We must keep our disappointment under"

(7) Down to defeat, death, or ruin

"Their competitors went under"

(8) Into unconsciousness

"This will put the patient under"

(9) Through a range downward

"Children six and under will be admitted free"