The Collaborative International Dictionary
Shab \Shab\, v. t. [imp. & p. p. Shabbed; p. pr. & vb. n. Shabbing.] [See Scab, 3.] To play mean tricks; to act shabbily. [Obs. or Prov. Eng.]
Shab \Shab\, n. [OE. shabbe, AS. sc?b. See Scab.] The itch in animals; also, a scab. [Obs. or Prov. Eng.]
Shab \Shab\, v. t.
To scratch; to rub. [Obs.]
--Farquhar.
Wiktionary
Etymology 1 n. 1 (context obsolete UK dialect English) scabies 2 (context obsolete UK dialect English) A scab. vb. (context obsolete English) To scratch; to rub. Etymology 2
vb. (context obsolete UK dialect English) To play mean tricks; to act shabbily.
Usage examples of "shab".
Is it possible I am in luck, and you are about to shab off from this dull do?
She knew it was wrong to shab off and leave Guy to clean up the mess, but it was the only way to disassociate herself from Thomas.
It was horrid for Auntie and me to shab off and leave you to finish up the mess.