verb
intrude
in-TROOD/ɪnˈtruːd/
To enter a place or become involved in a situation where one is not welcome.
The uninvited visitor intrudes on the private meeting.

Etymology
“Thrusting in” supplies the forceful image behind intrude. Applied to someone's presence or involvement, it means entering a place or situation without welcome, necessity, or right.
In context
be careful that you do not intrude upon a party already complete in themselves
More examples
- Noise intruded into the quiet room.
- They are intruding on her privacy.
- He apologized for having intruded.
Forms
intrude · intrudes · intruded · intruding