(physics) a briefevent in which two or more bodies come together; "the collision of the particles resulted in an exchange of energy and a change of direction"
make a strategic, offensive, assault against an enemy, opponent, or a target; "The Germans struck Poland on Sept. 1, 1939"; "We muststrike the enemy's oil fields"; "in the fifth inning, the Giants struck, sendingthree runners home to win the game 5 to 2"