What is the meaning of Slak?

snail

snail, slug (any gastropod)

slag (the impurities which result and are separated out when melting a metal or refining it from its ore)

hard, molten leftovers of burnt coal and other solid fuels

slack

gentle

loose

weak, feeble

slack

gentle

loose

weak, feeble

bindweed

slack, not taut (of something that can be taut, like a rope or sail or hanging flag)

flaccid (of a penis)

weak, powerless

snail

Source: wiktionary.org