chal·lis 
(shălē)
(shălē)n.
A soft, lightweight, usually printed fabric made of wool, cotton, or rayon.
[Possibly from the surname Challis.]
- on the button
- on the carpet
- on the cheap
- on the coattails of
- on the contrary
- on the cuff
- on the cusp
- on the defensive
- on the dole
- on the dot
- on the double
- on the drawing board
- on the edge
- on the face of it
- on the fence
- on the fly
- on the front burner
- on the go
- on the ground
- on the heels of
- on the hoof
- on the horns of a dilemma
- on the house
- on the increase
- on the inside