Green’s Dictionary of Slang

chiser n.

also chise, chiver
[var. on chiv n.1 ]

a knife.

[UK]‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc. 49: Chise — a knife, saw, or file [...] sometimes called a chiser, from chisel [...] Chiver (pron. shiver and shliver or shlivey) is derived from the same, but a little corrupted.