cheap shot

cheap shot

n.

An unfair or unsporting verbal attack on a vulnerable target.

Thesaurus

Noun	1.	cheap shot - an unnecessarily aggressive and unfair remark directed at a defenseless person gibe, jibe, barb, dig, shaft, slam, shot - an aggressive remark directed at a person like a missile and intended to have a telling effect; "his parting shot was `drop dead'"; "she threw shafts of sarcasm"; "she takes a dig at me every chance she gets"
	2.	cheap shot - an illegal and unsportsmanlike act of unnecessary violence; "he called a penalty on them when the lineman took a cheap shot at the quarterback" shot - a blow hard enough to cause injury; "he is still recovering from a shot to his leg"; "I caught him with a solid shot to the chin"