verb [V]
1 ~ (into / on / upon sb/sth) to go or be somewhere where you are not wanted or are not supposed to be:
I'm sorry to intrude, but I need to talk to someone. * legislation to stop newspapers from intruding on people's private lives
2 ~ (on / into upon sth) to disturb sth or have an unpleasant effect on it:
The sound of the telephone intruded into his dreams.
