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flat

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1flat/ˈflæt/adjective
flatterflattest
1flat
/ˈflæt/
adjective
flatterflattest
Learner's definition of FLAT  
: having a smooth, level, or even surface : not having curves or bumps
: having a wide, smooth surface and little thickness
of a shoe heel  : very low and wide
also of a shoe  : having a flat heel or no heel
: spread out on or along a surface
: very clear and definite : absolute
◊ In British English the expression and that's flat! is used to stress that a statement or decision is definite and will not be changed.
: not changing in amount
   b  : not having much business activity
: not having much interest or energy : dull
of a drink  : no longer having bubbles
of a tire  : not having enough air
music 
10  : lower than the true pitch
   b  : lower than a specified note by a semitone
— compare 1natural 8, 1sharp 13
11  of lighting conditions  : not producing strong shadows
13  British, of a battery  : no longer producing electricity : dead

(as) flat as a pancake

informal
: very flat

— flatly

adverb

— flatness

noun,[noncount]
2flat/ˈflæt/noun
pluralflats
2flat
/ˈflæt/
noun
pluralflats
Learner's definition of FLAT  
[count]
: a level area of land — usually plural
: a flat part or surface
: a musical note that is one semitone lower than a specified note
   b  : a written symbol ♭ that is placed before a note to show that it should be played a semitone lower
— compare 2natural, 3sharp
US  : a shallow box in which young plants are grown
chiefly US  : a shoe or slipper that has a flat heel or no heel — usually plural
chiefly British  : an apartment typically on one floor
— compare apartment
: a tire that does not have enough air
3flat/ˈflæt/adverb
3flat
/ˈflæt/
adverb
Learner's definition of FLAT  
: on or against a flat surface
   b  : in the position of someone or something that is lying spread out on the ground or another surface
: exactly or precisely — used to describe something that happens quickly
informal  : completely or absolutely
— see also flat out
: below the correct musical pitch
— compare 2sharp 2

fall flat

— see 1fall
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