the world > space > extension in space > expansion or enlargement > expand or enlarge [verb (intransitive)] > distend > swell > swell up (4)
intransitive. To reach a greater height or size; esp. to swell up, puff out.
intransitive. To swell up; to rise up by or as by swelling. Also figurative.
intransitive for reflexive (also with up). Of a floor, etc.: To swell or warp and rise.
intransitive. To become larger in bulk, increase in size (by pressure from within, as by absorption of moisture, or of material in the process of…