English
threadjack
Blend of thread + hijack.
Proto-Indo-European *terh₁- ‘rub’
Proto-Indo-European *treh₁-tu-s
Proto-Germanic *þrēduz ‘thread’
Old English þrǣd
Middle English thred
English thread
Today it means
verb To take over a discussion thread with a subject unrelated to the original posting.
Sources
Sources: Wiktionary, “threadjack”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / threadjack