Deliberate Attack on Another Using the Cranium
Puzzle 13 of Groups of Three Easy Pack
Question is: Deliberate Attack on Another Using the Cranium
and the answer is: HEADBUTT
Word Meaning:
HEADBUTT — A sharp blow delivered by driving the head into an opponent or object, generally by lowering the head and charging forward or by rapidly tilting the head backward and then forward.
Definitions from Wiktionary.