ob·trude 
(ŏb-trd, əb-)
(ŏb-trd, əb-)v. ob·trud·ed, ob·trud·ing, ob·trudes
v.tr.
1. To impose (oneself or one's ideas) on others with undue insistence or without invitation.
2. To thrust out; push forward.
v.intr.
To impose oneself on others.
[Latin obtrūdere : ob-, against; see OB- + trūdere, to thrust; see treud- in the Appendix of Indo-European roots.]
ob·truder n.
ob·trusion (-trzhən) n.