英和和英

発音

• 韻: -ænd
• IPA: /ɪkˈspænd/, /ɛkˈspænd/

動詞

expand (third-person singular simple present expands, present participle expanding, simple past and past participle expanded)

1. (transitive) To change (something) from a smaller form or size to a larger one; to spread out or lay open.

   You can expand this compact umbrella to cover a large table.

2. (transitive) To increase the extent, number, volume or scope of (something).

   A flower expands its leaves.

   • 1667, John Milton, “Book I”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC:

     Then with expanded wings he steers his flight.

   • 1961 October, “The winter timetables of British Railways: Scottish Region”, in Trains Illustrated, page 594:

     This has evidently been encouraging, for the current winter timetable - not even with the benefit of summer holiday traffic - shows that the two trains each way have been expanded to four.

   • 2016 February 1, Tom Whipple, “Microcannon firing nanobullets: the future of targeted medicine”, in The Times‎:

     When an ultrasonic beam is fired at the microcannons, the emulsion evaporates, expanding rapidly into gas. This creates enough force to push the nanobullets out at velocities reaching several metres per second.

3. (transitive) To express (something) at length and/or in detail.
4. (transitive, algebra) To rewrite (an expression) as a longer, yet equivalent, sum of terms.

   Use the binomial theorem to expand ${\displaystyle {(x+1)}^{4}}$.

5. (intransitive, algebra, of an expression) To become, by rewriting, a longer, yet equivalent, sum of terms.

   The expression ${\displaystyle {(x+1)}^{4}}$ expands to ${\displaystyle x^{4}+4x^{3}+6x^{2}+4x+1}$.

6. (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).

   Expanding ${\displaystyle 4/7}$ by ${\displaystyle 3}$ gives ${\displaystyle 12/21}$.

7. (intransitive) To change or grow from smaller to larger in form, number, or size.

   Many materials expand when heated.

   This compact umbrella expands to cover a large table.

8. (intransitive) To increase in extent, number, volume or scope.
9. (intransitive) To speak or write at length or in detail.

   He expanded on his plans for the business.

   • 1899, Stephen Crane, chapter 1, in Twelve O'Clock:

     There was some laughter, and Roddle was left free to expand his ideas on the periodic visits of cowboys to the town. “Mason Rickets, he had ten big punkins a-sittin' in front of his store, an' them fellers from the Upside-down-F ranch shot 'em up […] ”

10. (intransitive) To feel generous or optimistic.
11. (transitive, computing) In a hierarchical list (such as a directory tree or table of contents), to show the subentries of (an entry).

    Antonym: collapse

Conjugation

同意語

• (to change from a smaller form/size to a larger one): open out, spread, spread out, unfold
• (to increase the extent, number, volume or scope of): enlarge
• (to express at length or in detail): elaborate (on), expand on

反意語

• (antonym(s) of “to change from a smaller form/size to a larger one”): contract
• (antonym(s) of “to increase the extent, number, volume or scope of”): contract, limit
• (to express at length or in detail): limit
• (antonym(s) of “algebra: to rewrite as an equivalent sum of terms”): factor

派生語

関連する語