jab

To poke or thrust something quickly and sharply, often with a pointed object.

"She jabbed her elbow into his side."

A quick, sharp poke or thrust with something pointed.

"He gave the door a sharp jab."

To inject a substance, often a vaccine, into a person or animal.

"The nurse will jab your arm."

An injection, particularly a vaccination, given to protect against illness.

"I need to get my flu jab."