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under (EN)
preposition, adverb, adjective

preposition “under”

under
  1. located beneath or covered by something
    The children hid under the table during the game of hide and seek.
  2. beneath the surface level of a liquid
    Divers discovered a shipwreck under the sea.
  3. amounting to less than a specified number, degree, or quantity
    The temperature dropped to just under freezing last night.
  4. controlled by or subject to the authority of someone or something else
    The new recruits trained under the strict supervision of the sergeant.
  5. categorized or classified within a particular group or area
    You'll find the manual under the "Instruction Guides" section.
  6. experiencing pressure or difficulty because of a challenging situation
    The bridge buckled under the weight of the heavy trucks.
  7. identified by a particular name or alias that is not one's own
    She performed on stage under the pseudonym "Mystic Melody."

adverb “under”

under (more/most)
  1. in a lower position or rank, either physically or in status
    The submarine went under to avoid detection.
  2. not enough or lacking in quantity or degree
    The event was under-attended due to the bad weather.
  3. unconscious or asleep
    After the anesthesia was administered, the patient quickly went under.

adjective “under”

base form under, non-gradable
  1. positioned below something else, typically referring to a specific part
    The under layer of the cake was soaked with syrup.
  2. overpowered or dominated, often by an opposing force
    After the coup, the old government was kept under by the new regime.
  3. affected by anesthesia and not conscious or aware
    The surgeon waited until the patient was completely under before beginning the operation.
  4. overwhelmed to the point of collapse, failure, or destruction
    Many small shops went under during the economic downturn.