an underground body of water that breaks in on miners
2. geography
a hole through which a stream of water disappears underground
swallet in American English
(ˈswɑlɪt)
noun Brit
1.
an underground stream
2.
an opening through which a stream descends underground
Word origin
[1660–70; swall(ow)1 + -et]This word is first recorded in the period 1660–70. Other words that entered Englishat around the same time include: aspirate, cantilever, indicator, mainstream, vocalize-et is a noun suffix having a diminutive force (although the diminutive element is nowlost in many words). Other words that use the affix -et include: islet, midget, plummet, tablet