To increase the capacity of; to expand; to give free scope or greater scope to; also, to dilate, as with joy, affection, etc.
To become round or plump
Expand is defined as to increase in size, unfold or spread out.
To cause to grow; raise:
Find another word for round-out. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for round-out, like: enlarge, round-off, round, fill-out, finish out, expand, grow and round-down.