IPA: /ˈswɒləʊə/
KK: /ˈswɑːloʊər/
A person or animal that swallows something, such as food or drink.
The swallower quickly gulped down the water after the long run.
Swallower → It is formed from "swallow" (from Old English *swelgan*, meaning to engulf or consume) and "-er" (meaning a person who). A swallower is a person or thing that engulfs or consumes something.
Think of someone who 'engulfs' ('swelgan') something — that's why a swallower is someone who consumes.