The difference between Flap and Swap
When used as nouns, flap means a blow or slap (especially to the face), whereas swap means an exchange of two comparable things.
When used as verbs, flap means to move (something broad and loose) up and down, whereas swap means to exchange or give (something) in an exchange (for something else).
check bellow for the other definitions of Flap and Swap
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Flap as a noun (obsolete):
A blow or slap (especially to the face).
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Flap as a noun (obsolete):
A young prostitute.
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Flap as a noun:
Anything broad and flexible that hangs loose, or that is attached by one side or end and is easily moved.
Examples:
"a flap of a garment; The envelope flap seemed curiously wrinkled."
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Flap as a noun:
A hinged leaf.
Examples:
"the flaps of a table; the flap of a shutter"
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Flap as a noun:
A side fin of a ray - also termed a wing.
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Flap as a noun:
An upset, stir, scandal or controversy
Examples:
"The comment caused quite a flap in the newspapers."
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Flap as a noun:
The motion of anything broad and loose, or a stroke or sound made with it.
Examples:
"the flap of a sail; the flap of a wing"
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Flap as a noun:
A disease in the lips of horses.
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Flap as a noun (aviation):
A hinged surface on the trailing edge of the wings of an aeroplane.
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Flap as a noun (phonetics):
A consonant sound made by a single muscle contraction, such as the sound ɾ in the standard American English pronunciation of body.
Examples:
"synonyms: tap"
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Flap as a noun (surgery):
A piece of tissue incompletely detached from the body, as an intermediate stage of plastic surgery.
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Flap as a noun (slang, vulgar, chiefly [[plural]]):
The female genitals.
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Flap as a verb (transitive):
To move (something broad and loose) up and down.
Examples:
"The crow slowly flapped its wings."
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Swap as a verb (transitive):
To exchange or give (something) in an exchange (for something else).
Examples:
"synonyms exchange switch trade"
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Swap as a verb (transitive, obsolete):
To hit, to strike.
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Swap as a verb (transitive, obsolete):
To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
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Swap as a verb (intransitive, obsolete):
To descend or fall; to rush hastily or violently.
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Swap as a noun:
An exchange of two comparable things.
Examples:
"quote-book lang=1819 w Sir Walter Scott w Tales of My Landlord section=The Bride of Lammermoor passage=I e’en changed it, as occasion served, with the skippers o’ Dutch luggers and French vessels, for gin and brandy... a gude swap too, between what cheereth the soul of man and that which dingeth it clean out of his body"
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Swap as a noun (finance):
A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
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Swap as a noun (computing, informal, uncountable):
Space available in a swap file for use as auxiliary memory.
Examples:
"How much swap do you need?"
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Swap as a noun (obsolete, UK, dialect):
A blow; a stroke.