Headbutt
Definition 1 of 2

Combat
In sports or fights, a headbutt can be an effective strategy, though it's against the rules in many contexts.

The fighter landed a headbutt, knocking his opponent off balance.
Aggression
The term carries aggressive connotations and should be used carefully, as it may provoke negative reactions.

He acted out of anger when he decided to headbutt the wall.
Playfulness
In some contexts, a headbutt can be playful, especially among friends or in jest.

The puppies were playfully headbutting each other.
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