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flat (EN)
adjective, adverb, noun

adjective “flat”

flat, comparative flatter, superlative flattest
  1. having a level, smooth surface without any bumps or slopes
    We walked across the flat field to reach the lake.
  2. broad and not high
    The bakery produces several types of flat bread.
  3. lacking energy, interest, or excitement; dull
    The play was flat and failed to captivate the audience.
  4. (of a beverage) no longer fizzy; without bubbles
    The soda tasted flat because it was left open.
  5. (of a tire) deflated; having no air
    We couldn't drive further because we had a flat tire.
  6. (of a battery) completely discharged; dead
    My laptop battery is flat, and I need to recharge it.
  7. (music) lower in pitch than it should be
    His singing was slightly flat during the performance.
  8. fixed and unchanging; not varying
    The taxi service charges a flat rate, regardless of distance.
  9. complete and definite; absolute
    She gave me a flat "no" when I asked for a favor.

adverb “flat”

flat
  1. in a level or smooth manner; so as to be flat
    Spread the quilt flat over the bed.
  2. (UK, informal) completely; absolutely
    He refused flat to help me with the project.
  3. in exactly the time specified; precisely
    She ran the race in three minutes flat.
  4. (in music) at a lower pitch than required
    The violinist played a bit flat.

noun “flat”

singular flat, plural flats
  1. (UK) a set of rooms for living in, usually on one floor of a building; an apartment
    They bought a new flat overlooking the river.
  2. an area of level ground, often near a body of water
    The mud flats are rich feeding grounds for birds.
  3. the flat side of an object, especially a blade
    He struck the opponent with the flat of his sword.
  4. a musical note that is one semitone lower than a natural note
    This melody is in A flat major.
  5. (informal) a tire without air; a deflated tire
    I had to pull over because of a flat.