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He $passed\, himself\, off$ as a noble man.

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This matter has been $hanging\ fire$ for the last many months and must therefore be decided one way or the other.

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Mohan always $keeps\, himself\, to\, himself$.

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There was no opposition to the new policy by the $rank\, and\, file$ of the Government.

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The robber $took\, to\, his\, heels$ when the police arrived.

Some idioms/phrases are given below together with their meanings. Choose the correct meaning of the idiom/phrase: 'To end in smoke'.