1. Having an even and horizontal surface, or nearly so, without prominences or depressions; level without inclination; plane.
"Though sun and moon Were in the flat sea sunk." -- Milton.
2. Lying at full length, or spread out, upon the ground; level with the ground or earth; prostrate; as, to lie flat on the ground; hence, fallen; laid low; ruined; destroyed.
"What ruins kingdoms, and lays cities flat!" -- Milton.
"I feel . . . my hopes all flat." -- Milton.
3. (Fine Arts) Wanting relief; destitute of variety; without points of prominence and striking interest.
"A large part of the work is, to me, very flat." -- Coleridge.
4. Tasteless; stale; vapid; insipid; dead; as, fruit or drink flat to the taste.
5. Unanimated; dull; uninteresting; without point or spirit; monotonous; as, a flat speech or composition.
"How weary, stale, flat, and unprofitable Seem to me all the uses of this world." -- Shak.
6. Lacking liveliness of commercial exchange and dealings; depressed; dull; as, the market is flat.
7. Clear; unmistakable; peremptory; absolute; positive; downright.
"Flat burglary as ever was committed." -- Shak.
"A great tobacco taker too, -- that's flat." -- Marston.
8. (Mus.) (a) Below the true pitch; hence, as applied to intervals, minor, or lower by a half step; as, a flat seventh; A flat. (b) Not sharp or shrill; not acute; as, a flat sound.
9. (Phonetics) Sonant; vocal; -- applied to any one of the sonant or vocal consonants, as distinguished from a nonsonant (or sharp) consonant.
(Arch.) See under Arch, n., 2. (b).
cap paper, not folded. See under Paper.
in fine art metal working, a mode of ornamenting silverware, etc., producing figures by dots and lines made with a punching tool. Knight.
a sculptor's chisel for smoothing.
a file wider than its thickness, and of rectangular section. See File.
a small, sharp- pointed, wrought nail, with a flat, thin head, larger than a tack. Knight.
paper which has not been folded.
a railroad rail consisting of a simple flat bar spiked to a longitudinal sleeper.
(Mining), horizontal or inclined connecting rods, for transmitting motion to pump rods at a distance. Raymond.
a rope made by plaiting instead of twisting; gasket; sennit. Some flat hoisting ropes, as for mining shafts, are made by sewing together a number of ropes, making a wide, flat band. Knight.
(Geom.) See Euclidian space.
the process of wood engraving. [Obs.]
(Painting), a coat of water color of one uniform shade.
To fall flat
(Fig.), to produce no effect; to fail in the intended effect; as, his speech fell flat.
"Of all who fell by saber or by shot, Not one fell half so flat as Walter Scott." -- Lord Erskine.