impact
noun.
the striking of one body against another
noun.
a forceful consequence; a strong effect
the book had an important impact on my thinking|the book packs a wallop
Synonym: wallop
noun.
influencing strongly
they resented the impingement of American values on European culture
noun.
the violent interaction of individuals or groups entering into combat
the armies met in the shock of battle
Synonym: shock
verb.
press or wedge together; pack together
verb.
have an effect upon
Will the new rules affect me?