expand

verb

1. 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.”
2. To increase the extent, number, volume or scope of (something).“A flower expands its leaves.”
3. To express (something) at length and/or in detail.
4. To rewrite (an expression) as a longer, yet equivalent sum of terms.“Use the binomial theorem to expand {(x+1)}^4.”