Etymology
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worry wart (n.)

1930, from newspaper comic "Out Our Way" by U.S. cartoonist J.R. Williams (1888-1957), in which Worry Wart is attested by 1929. Worry Wart was a generic nickname or insult for any character who caused others to worry, which is the inverse of the current colloquial meaning. For example, from the comic printed in the Los Angeles Record, Dec. 5, 1929: One kid scolds another for driving a screw with a hammer "You doggone worry wart! Poundin' on a nut till it's buried inta th' table!" (etc.).

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van de Graaff 
in reference to an electrostatic charge generator, 1934, named for U.S. physicist R.J. van de Graaff (1901-1967).
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Double Dutch 

"gibberish, incomprehensible language," by 1847 (High Dutch for "incomprehensible language" is recorded by 1789); from double (adj.) + Dutch.

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sweet tooth (n.)
"fondness for sugary stuff," late 14c., from sweet (adj.) + tooth in the sense of "taste, liking" (see toothsome).
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res 

Latin word once used in various phrases in English, often in legal language, where it means "the condition of something, the matter in hand or point at issue;" literally "thing" (see re). For example res ipsa loquitur "the thing speaks for itself;" res judicata "a point decided by competent authority."

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pied a terre (n.)
"small town house or rooms used for short residences," 1829, French, pied à terre, literally "foot on the ground."
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fer de lance (n.)

large venomous snake of American tropics, 1817, from French, "lance-head," literally "iron of a lance." So called for its shape.

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Arbor Day 
day set aside in U.S. "for planting forest trees to make lumber for the generations yet to come" ["Congressional Record," June 1892], first celebrated April 10, 1872, in Nebraska (a largely treeless state), the brainchild of U.S. agriculturalist and journalist J. Sterling Morton (1832-1902). From Latin arbor, arboris "tree" (see arbor (n.2)).
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Marie Antoinette 

(1755-1793), queen consort of Louis XVI; as the name for a decorative style of France in that period, by 1887. She likely did not say "let them eat cake" (see cake (n.)). The city of Marietta, Ohio, U.S., founded in 1788, was named for her in honor of Louis XVI's financial support of the American Revolution.

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thank you 
polite formula used in acknowledging a favor, c. 1400, short for I thank you (see thank). As a noun, from 1792.
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