interference
/ˌɪntɚˈfirəns/
noun
[noncount] involvement in the activities and concerns of other people when your involvement is not wanted :the act of interfering
additional signals that weaken or block the main signal in a radio or television broadcast
sports :the act of illegally hitting or getting in the way of an opponent
run interference
American football :to run in front of the player who is carrying the ball in order to block opponents - often used figuratively