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(transitive) To change (something) from a smaller form or size to a larger one; to spread out or lay open.
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(transitive) To increase the extent, number, volume or scope of (something).
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(transitive) To express (something) at length and/or in detail.
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(transitive, algebra) To rewrite (an expression) as a longer, yet equivalent, sum of terms.
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(intransitive, algebra, of an expression) To become, by rewriting, a longer, yet equivalent, sum of terms.
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(transitive, arithmetic) To multiply both the numerator and the denominator of a fraction by the same (non-zero) number (which yields a fraction of equal value).
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(intransitive) To change or grow from smaller to larger in form, number, or size.
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(intransitive) To increase in extent, number, volume or scope.
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(intransitive) To speak or write at length or in detail.
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(intransitive) To feel generous or optimistic.
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(transitive, computing) In a hierarchical list (such as a directory tree or table of contents), to show the subentries of (an entry).