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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121) He feels boxed in, living in that tiny flat.
122) The worker hammered the iron flat.
123) The road stretched ahead across the flat landscape.
124) The flat was in a poor state of repair.
125) Lay the cloth flat across the table.
126) Your piano is flat; it needs tuning.
127) I thought her performance a little flat.
128) Arsenal looked flat for large parts of the game.
129) Work on a clean,[http://sentencedict.com/flat.html] flat surface.
130) marathon, she was flat out for a week.
131) Their teachers live in a high-rise flat.
132) They live in a poky little flat.
133) He stopped to change a flat .
134) My flat is on the ground floor.
135) Everything seems so flat since Robert left.
136) He lay flat on the floor.
137) The river slows on the flat bottom.
138) He forgot the punchline and the joke fell flat.
139) The colours used are flat and unvaried.
140) Jenny now lives in a terraced ground floor flat.
141) Are you pleased with the new flat?
142) She could hear music coming from the upstairs flat.
143) She lay flat on the ground.
144) Do you live in a flat or a house?
145) She got up early and cleaned the flat.
146) Tim is part-owner of the flat.
147) He has the flat on a long lease.
148) Flat lighting is typical of Avedon's portraits.
149) He spoke in a flat monotone.
150) I'm not coming, and that's flat!