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участливым
解开 jiěkāi
undo <undid; undone> [ˌʌnˈduː] VB trans
1. undo:
undo
解开 jiěkāi
undo
打开 dǎkāi
2. undo:
undo
消除 xiāochú
undo
破坏 pòhuài
Present
Iundo
youundo
he/she/itundoes
weundo
youundo
theyundo
Past
Iundid
youundid
he/she/itundid
weundid
youundid
theyundid
Present Perfect
Ihaveundone
youhaveundone
he/she/ithasundone
wehaveundone
youhaveundone
theyhaveundone
Past Perfect
Ihadundone
youhadundone
he/she/ithadundone
wehadundone
youhadundone
theyhadundone
PONS OpenDict

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Examples from the PONS Dictionary (editorially verified)
unfasten [or undo] the button
解开纽扣 jiěkāi niǔkòu
Monolingual examples (not verified by PONS Editors)
In the 19th century these alterations were to some extent undone.
en.wikipedia.org
Any fastened nails must be undone, and no one should be punching nails to avoid stalled birth.
en.wikipedia.org
With deep and highly customisable settings, countdown clocks, and a self-imposed lock-out feature that's very time-consuming to undo, you'll never dilly-dally online while you should be working again.
www.itproportal.com
In this case more sophisticated techniques that involve multiple undo levels are used.
en.wikipedia.org
However, the cloth was taken out about every two hours to undo plaits and wrinkles.
en.wikipedia.org