interfere
1. [ verb ] come between so as to be hindrance or obstacle
Examples:

"Your talking interferes with my work!"

Related terms: impede hindrance
2. [ verb ] get involved, so as to alter or hinder an action, or through force or threat of force
Synonyms: intervene step_in interpose
Examples:

"Why did the U.S. not intervene earlier in WW II?"

Related terms: interact meddle poke_into interlope intervention
Similar spelling:   interference
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  in_the_air