Swelg(-h)

According to the Old English Dictionary:

swelg(-h)

a chasm, swallow (D.D.) :-- Swelh hiatum, opertionem l foueam terrae, An. Ox. 50, 5. [Wick. sweluȝ vorago: Prompt Parv. sweluh: Mand. swelogh: M. Du. swelgh: M.L. Ger. swelch: Icel. svelgr a whirlpool, current, stream.] v. ge-swelg; swelgend, swilige. swelg-h