Green’s Dictionary of Slang

smush v.

[obs. SE]

to snatch, to seize.

[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]T. Morton Way to Get Married in Inchbold (1808) XXV 55: Your friend [...] left it [i.e. a legacy] to you, and the old sly thief smushed it.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[US]Matsell Vocabulum.