ly·sis 
(līsĭs)
(līsĭs)n. pl. ly·ses (-sēz)
1. Biochemistry The dissolution or destruction of cells, such as blood cells or bacteria, as by the action of a specific lysin that disrupts the cell membrane.
2. Medicine The gradual subsiding of the symptoms of an acute disease.
[New Latin, from Latin, a loosening, from Greek lusis, from lūein, to loosen; see leu- in the Appendix of Indo-European roots.]
- on the brain
- on the breadline
- on the bubble
- on the bum
- 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