Englishfor English speakers
undertaking
Noun
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The work of an undertaker; the management of funerals.
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A promise or pledge; a guarantee.
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Any business, work, or project that a person does or tries to do.
The re-organization of the company was a large undertaking.
of
Preposition
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Made using.
It is a house of cards.
obligation
Noun
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An obligation is a duty, something you must do.