verb
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(transitive) To reverse or change the order of (two or more things); to swap or interchange.
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(transitive, music) To rewrite or perform (a piece) in another key.
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(transitive, algebra) To move (a term) from one side of an algebraic equation to the other, reversing the sign of the term.
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(transitive, linear algebra) To rearrange elements in a matrix, by interchanging their respective row and column positional indicators.
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(transitive, graph theory) To reverse the direction of every edge of (a graph).
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(transitive, law, chiefly of the European Union) To give force to a directive by passing appropriate implementation measures.
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(intransitive, chess) To reach a position that may also be obtained from a different move order.