expand

verb

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

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

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

  "A flower expands its leaves."

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

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

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

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

• To multiply both the numerator and the denominator of a fraction by the same natural number yielding a fraction of equal value
• To change from a smaller form/size to a larger one.

  "Many materials expand when heated."

• To increase in extent, number, volume or scope.
• To speak or write at length or in detail.

  "He expanded on his plans for the business."

• To feel generous or optimistic.