This is the 8153rd most frequent Russian word.
линь
"Линь" is "tench" (a type of freshwater fish) in English.
Here, 'линь' is used as a noun referring to the fish species 'tench'.
В озере у нас водится линь.
In the lake, we have tench.
In this sentence, 'линь' refers to a rope, cords in a nautical context or general application.
Линь верёвки начал разматываться.
The rope's line started to unravel.
This usage also describes 'линь' as a technical term referring to a rope or line used on a ship.