What is the meaning of Expand?

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

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

To express (something) at length and/or in detail.

To rewrite (an expression) as a longer, yet equivalent, sum of terms.

To become, by rewriting, a longer, yet equivalent, sum of terms.

To multiply both the numerator and the denominator of a fraction by the same (non-zero) number (which yields a fraction of equal value).

To change or grow from smaller to larger in form, number, or size.

To increase in extent, number, volume or scope.

To speak or write at length or in detail.

To feel generous or optimistic.

In a hierarchical list (such as a directory tree or table of contents), to show the subentries of (an entry).

Source: wiktionary.org