Real Dictionary

swell
adjective: You can describe something as swell if you think it is really nice.
countable noun: A swell is the regular movement of waves up and down in the open sea.
verb: If something such as a part of your body swells, it becomes larger and rounder than normal.
verb: If sounds swell, they get louder.
verb: If the amount or size of something swells or if something swells it, it becomes larger than it was before.
verb: If you swell with a feeling, you are suddenly full of that feeling.

swell in American English
to increase in volume or become larger as a result of pressure from within; expand; dilate
adjective: stylish; elegant
intransitive verb: to grow in bulk, as by the absorption of moisture or the processes of growth
noun: the act of swelling or the condition of being swollen
transitive verb: to cause to grow in bulk

swell in British English
noun: the undulating movement of the surface of the open sea
verb: to grow or cause to grow in size, esp as a result of internal pressure