under
1. [ pronoun ] preposition, relatively lower
Synonyms: underneath beneath below
2. [ adjective ] located below or beneath something else
Synonyms: nether
Examples:

"nether garments" "the under parts of a machine"

Related terms: low
3. [ adverb ] down to defeat, death, or ruin
Examples:

"their competitors went under"

4. [ adjective ] lower in rank, power, or authority
Examples:

"an under secretary"

Related terms: subordinate
5. [ adverb ] into unconsciousness
Examples:

"this will put the patient under"

6. [ adverb ] below the horizon
Examples:

"the sun went under"

7. [ adverb ] down below
Examples:

"get under quickly!"

8. [ adverb ] in or into a state of subordination or subjugation
Examples:

"we must keep our disappointment under"

9. [ adverb ] through a range downward
Examples:

"children six and under will be admitted free"

10. [ pronoun ] preposition, whose position or status is lower than
Synonyms: below beneath underneath
11. [ adverb ] below some quantity or limit
Examples:

"fifty dollars or under"

12. [ adverb ] further down
Synonyms: below
Examples:

"see under for further discussion"

Similar spelling:   undergo
  undertow
  underage
  underarm
  underbid
  undercut
  underdog
  underfed
  underfur
  underlay
  underlie
  underpay
  underpin
  undersea
  under_it
  underway
  underact
  undoer
  untier
  untrod
  untrue
  undrape
  undrawn
  undress
  undried
  undrunk
  untired
  untried
  untruly
  untruth