Learn on Dutch : IJsberen

Literally meaning "to polar bear" walking in circles nervously or out of boredom. Derived from The behavior of polar bears in zoos.
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Learn on German : Alkoholleichen

Drunk people wandering home late at night/early morning.
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Learn on Japanese : Shimau

Combined with a verb to indicate something was done without meaning to or recklessly.
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Learn on Swedish, Scanian : Skula

to seek shelter from (and wait out) a rain shower.
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Learn on Irish : Aduantas

a feeling of unease or fear brought on by unfamiliar surroundings.
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Learn on Greek : άπειρος

The word can denote both 'infinite' and 'inexperienced'. Because one can not experience infinity.
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Learn on Chinese : “hún dàn (混蛋) = literally “mixed egg”

A person who has at least two biological fathers and one biological mother, the idea being that the mother mated with two or more males in quick succession and a mosaic embryo was formed.
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Learn on German : Notgeil

Being so horny it's an emergency.
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Learn on Nahuatl : Chichihualtzitzquia

to touch the breasts of a woman.
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Learn on German : Strohwitwer

Literally "straw widow." Noun: A husband who's home alone while his wife is out of town.
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Learn on Ithkuil : Ašţal

That chin-stroking moment you get, often accompanied by a frown on your face, when someone expresses an idea that you’ve never thought of and you have a moment of suddenly seeing possibilities you never saw before.
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Learn on Hungarian : Elpusztul

lit.: perish. Said specifically to mean the death of an animal or a plant (an unconscious being) as opposed to the death a person.
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Learn on German : Mahnmal

A specialised form of memorial, which would be "Denkmal". "mahnen" means "to remind, caution, urge", "Mal" is the -ial" part. Hence why "Holocaust memorial" is a very, very fuzzy translation.
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Learn on Brazilian Portuguese : Arretado

(adj.) awesome, skillful, intrepid, angry.
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Learn on HUNGARIAN : Köldökszösz

The dirt from one's bellybutton on the clothes. ;).
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Learn on Japanese : Aizuchi

To interject into a monologue with a short phrase to indicate understanding and active listening.
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Learn on Swedish : Palla

to steal fruit from a tree.
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Learn on German : Kummerspeck

'Grief Bacon', the weight you gain from overeating while upset.
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Learn on German : Schadenfreude

the pleasure derived from observing others' misfortune.
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Learn on Icelandic : Gluggaveður (lit. window-weather)

It's the kind of weather that is nice to look at through the window but not nice to be out in.
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Learn on Norwegian : Jo

"Yes" when replying to a negative claim or question.
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Learn on German : Bildungslücke

A gap in your education or your knowledge of pop culture.
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Learn on Mayan : Hatza-ha

The humid-smelling wind that blows before rain.
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Learn on !Xóõ : ǂnūu

chase off a storm because of threatening lightning strikes by waving a burning branch and throwing it into the sky or by rubbing armpit sweat onto oneself and saying "sūi sàa-tê.".
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Learn on Scottish : Tartle

The awkward moment when you forget someone's name and are hesitant to introduce them.
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Learn on Chinese : 吸猫 xī māo

To zone out and enjoy the company of a cat, as if it were a drug. Lit. “snort/suck cat”.
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Learn on German : Schwarzfahren

The act of riding on public transport without a ticket.
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Learn on Hindi : Jugaad

a frugal yet creative and highly effective solution to a problem which everyone is solving with the usual scripted and expensive way.
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Learn on English : Kitty-corner

diaganolly adjacent.
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