Expound vs. Expand — What's the Difference?

Present and explain (a theory or idea) in detail

To increase the size, volume, quantity, or scope of; enlarge

To explain in detail; elucidate

To express at length or in detail; enlarge on

To make known or set forth; present

To open (something) up or out; spread out

To make a detailed statement

(Mathematics) To write (a quantity) as a sum of terms in an extended form.

(transitive) To set out the meaning of; to explain or discuss at length

To become greater in size, volume, quantity, or scope

(intransitive) To make a statement, especially at length.

To speak or write at length or in detail

To lay open; to expose to view; to examine.

To open up or out; unfold

To lay open the meaning of; to explain; to clear of obscurity; to interpret; as, to expound a text of Scripture, a law, a word, a meaning, or a riddle.

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

Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing;

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

State;

(transitive) 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 natural number yielding a fraction of equal value

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

(intransitive) To increase in extent, number, volume or scope.

(intransitive) To speak or write at length or in detail.

(intransitive) To feel generous or optimistic.

To lay open by extending; to open wide; to spread out; to diffuse; as, a flower expands its leaves.

To cause the particles or parts of to spread themselves or stand apart, thus increasing bulk without addition of substance; to make to occupy more space; to dilate; to distend; to extend every way; to enlarge; - opposed to contract; as, to expand the chest; heat expands all bodies; to expand the sphere of benevolence.

To state in enlarged form; to develop; as, to expand an equation. See Expansion, 5.

To become widely opened, spread apart, dilated, distended, or enlarged; as, flowers expand in the spring; metals expand by heat; the heart expands with joy.

Extend in one or more directions;

Become larger in size or volume or quantity;

Make bigger or wider in size, volume, or quantity;

Grow stronger;

Exaggerate or make bigger;

Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing;

Expand the influence of;