Where does “catty-mount” come from?

catty-mount (English) comes from English catamount, from English catamountain, from English cat o' mountain.

catty-mount (English): catamount

Definitions

Step	Language	Word	Meaning
1	English	catamount	A wild animal of the family Felidae, especially...
2	English	catamountain	—
3	English	cat o' mountain	—

catty-mount — Etymology, Origin & Word History | Etymology Explorer