To obtrude is to push yourself forward where you are not wanted. Obtrude on their grief, obtrude an opinion, refuse to obtrude.
It is formal and disapproving, and the related adjective obtrusive is far commoner — an obtrusive camera is one you cannot stop noticing. Unobtrusive, the polite opposite, is the form most people actually use.
1verbobtrudeTo push yourself forward where you are not wanted.
“I don't want to obtrude on your family's grief, but I wanted to offer my help.”
obtrude is an intruding.
Latin obtrudere means to thrust against — ob, against, plus trudere, to thrust. Intrude is the same verb.
Proto-Indo-European
*trewd-
Latin
obtrūdō — thrust off or against
English, today
obtrude
Built from
From Latin obtrūdō (“thrust off or against”), from ob- (“ob-”) + trudo (“thrust”).
Etymology from Wiktionary, CC BY-SA