verb
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to open (the covering, curtain, door, etc.); to unclose.
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to unfold or unroll (as a book).
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to reveal, make known (the meaning, intention, one's inner feelings, etc.).
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to make available for use, competition or participation, without restriction, taxation, fee, etc.
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to start operating, going, etc. (as a shop, new business etc.).
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to become open.
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(a book, roll of a sheet, etc.) to be spread out; to become unfold.
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(a flower-bud) to open into blossoms.