jab

Concise Oxford English Dictionary © 2008 Oxford University Press:
jab/ʤab/

▶verb (jabs, jabbing, jabbed) poke roughly or quickly with something sharp or pointed. ▶noun

• 1 a quick, sharp poke or blow.

• 2 Brit. informal a hypodermic injection, especially a vaccination.

– origin C19 (orig. Scots): var. of job2.