1) Catlike 2) Coil 3) Feline 1) Classic toy 2) Coiled stair-walker 3) Coiled toy 4) Form-fitting 5) It goes downstairs 6) Like a soft, clingy gown 7) Spring down stairs 8) Spring toy 9) Spring-like toy 10) Stair toy 11) Step-descending toy 12) Toy used on flights 
Slinky is a toy, a precompressed helical spring invented by Richard James in the early 1940s. It can perform a number of tricks, including travelling down a flight of steps end-over-end as it stretches and re-forms itself with the aid of gravity and its own momentum, or appear to levitate for a period of time after it has been dropped. These inter...
• (a.) Thin; lank.
Slink'y adjective Thin; lank. [ Prov. Eng. & U. S.] 
Slinky is slang for to have a stealthy gait.
See slingshot.