Synonym: apartment, dull, even, horizontal, level, lifeless, off-key, smooth, suite, unmusical. Antonym: bumpy, rough, sharp, uneven. Similar words: inflation, flag, flash, flame, flavor, flare up, flamboyant, late. Meaning: [flæt] 
n. 1. a level tract of land 2. a shallow box in which seedlings are started 3. a musical notation indicating one half step lower than the note named 4. freight car without permanent sides or roof 5. a deflated pneumatic tire 6. scenery consisting of a wooden frame covered with painted canvas; part of a stage setting 7. a suite of rooms usually on one floor of an apartment house. adj. 1. having a surface without slope, tilt in which no part is higher or lower than another 2. having a relatively broad surface in relation to depth or thickness 3. not modified or restricted by reservations 4. stretched out and lying at full length along the ground 5. lacking contrast or shading between tones 6. lowered in pitch by one chromatic semitone 7. flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) 8. lacking taste or flavor or tang 9. lacking stimulating characteristics; uninteresting 10. having lost effervescence 11. (of taxes) not increasing as the amount taxed increases 12. sounded or spoken in a tone unvarying in pitch 13. horizontally level 14. lacking the expected range or depth; not designed to give an illusion or depth 15. (of a tire) completely or partially deflated 16. not reflecting light; not glossy 17. commercially inactive. adv. 1. with flat sails 2. in a forthright manner; candidly or frankly.
n. 1. a level tract of land 2. a shallow box in which seedlings are started 3. a musical notation indicating one half step lower than the note named 4. freight car without permanent sides or roof 5. a deflated pneumatic tire 6. scenery consisting of a wooden frame covered with painted canvas; part of a stage setting 7. a suite of rooms usually on one floor of an apartment house. adj. 1. having a surface without slope, tilt in which no part is higher or lower than another 2. having a relatively broad surface in relation to depth or thickness 3. not modified or restricted by reservations 4. stretched out and lying at full length along the ground 5. lacking contrast or shading between tones 6. lowered in pitch by one chromatic semitone 7. flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) 8. lacking taste or flavor or tang 9. lacking stimulating characteristics; uninteresting 10. having lost effervescence 11. (of taxes) not increasing as the amount taxed increases 12. sounded or spoken in a tone unvarying in pitch 13. horizontally level 14. lacking the expected range or depth; not designed to give an illusion or depth 15. (of a tire) completely or partially deflated 16. not reflecting light; not glossy 17. commercially inactive. adv. 1. with flat sails 2. in a forthright manner; candidly or frankly. 
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31) I found that my flat had been burgled.
32) I had a flat tyre on the way home.
33) An ice rink needs to be completely flat.
34) The cloth should be laid flat.
35) The meltwater puddled the flat sea ice.
36) He held a sole tenancy of a flat.
37) People used to think the earth was flat.
38) The whole flat had been ransacked.
39) The sails hung limply in the flat calm .
40) The car was going flat out at 120 mph.
41) Seals basked on boulders in a flat calm.
42) Living in that small flat,[sentencedict.com/flat.html]she feels boxed in.
43) They had put a padlock on the door of his flat.
44) His abductors blindfolded him and drove him to a flat in southern Beirut.
45) They said we could have the use of their flat at the coast whenever they weren't there.
46) Living in a flat is all right, but it has its limitations - for example, you don't have your own garden.
47) I'm 27, have a nice flat, a good job and I'm not unattractive.
48) I invited him back to my flat for a coffee.
49) Some of us get dipped in flat, some in satin, some in gloss. But every once in a while, you find someone who's iridescent, and when you do, nothing will ever compare.
50) The driver jacked up his car to change the flat tire.
51) A broad valley opened up leading to a high, flat plateau of cultivated land.
52) She had small feet and hands and a flat, round face.
53) The police also found a quantity of ammunition in the flat.
54) We live in a ground floor flat which backs onto a busy street.
55) My car only does about 60 mph, even when it's going flat out.
56) Sara lives with her husband and children in a flat in central London.
57) Exercise is the only way to get a flat stomach after having a baby.
58) We've bought a flat in the very centre of Cambridge.
59) Forensic scientists are going over the victim's flat in a search for clues about the murderer.
60) The town police wear dark blue uniforms and flat caps.