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v.

Present participle of undo.

n.

1. The act of unfastening or loosening.
2. 1. Ruin; destruction.
   2. The act of bringing to ruin.
   3. A cause or source of ruin; downfall: Greed was his undoing.
3. The act of reversing or annulling something accomplished; a cancellation.

noun

1. The act of destroying or state of being destroyed: bane, destruction, devastation, havoc, ruin, ruination, wrack¹, wreck, wreckage. See help/harm/harmless, leftover.
2. Something that causes total loss or severe impairment, as of one's health, fortune, honor, or hopes: bane, destroyer, destruction, downfall, ruin, ruination, wrecker. See help/harm/harmless.

n

Definition: destruction, misfortune
Antonyms: building, creation, doing, good fortune

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IN BRIEF: Making become unfastened or loosened. Also: Ruin.

To think too long about doing a thing often becomes its undoing. — Eva Young.

Dansk (Danish)
n. - skæbne, undergang, ruin

idioms:

• be the undoing of    være (nogets) undergang

Nederlands (Dutch)
(oorzaak van) ondergang, verderf, het tenietdoen, het los-/ openmaken

Français (French)
n. - perte (littér)

idioms:

• be the undoing of    causer la perte de

Deutsch (German)
n. - Verderben

idioms:

• be the undoing of    jmds. Verderben sein

Ελληνική (Greek)
n. - λύσιμο, καταστροφή, αφανισμός

idioms:

• be the undoing of    είμαι η καταστροφή κάποιου

Italiano (Italian)
rovina

idioms:

• be the undoing of    rovinare

Português (Portuguese)
n. - desfazimento (m), anulação (f), ruína (f)

idioms:

• be the undoing of    ser a ruína de

Русский (Russian)
уничтожение, гибель, аннулирование, порча, развязывание (узла и пр.), расстегивание, разборка на части

idioms:

• be the undoing of    быть причиной гибели или уничтожения

Español (Spanish)
n. - ruina, perdición, reparación

idioms:

• be the undoing of    ser la ruina de

Svenska (Swedish)
n. - fördärv, olycka, undergång

中文（简体） (Chinese (Simplified))
毁灭, 取消

idioms:

• be the undoing of    是...毁灭的原因

中文（繁體） (Chinese (Traditional))
n. - 毀滅, 取消

idioms:

• be the undoing of    是...毀滅的原因

한국어 (Korean)
n. - 원래대로 해놓기, 파멸

idioms:

• be the undoing of    ~을 원상 복구하다

日本語 (Japanese)
n. - 解くこと, もと通りにすること, 取り消し, 破滅, 失敗, 元通りにすること

idioms:

• be the undoing of    取り消しになる

العربيه (Arabic)
‏(الاسم) فك, حل, خراب او سبب خراب, ابطال, الغاء‏

עברית (Hebrew)
n. - ‮חיסול, הרס, חורבן, התרה‬

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