Fetching details from the dictionary...
fellow traveler; fellow traveller; travelling companion
taking someone along unwillingly (e.g. in death); forcing to take part
旅の道連れを得て、心強い。
Finding a travel companion for the journey makes me feel reassured.
崩れる建物の中、彼は主人公を道連れにしようとした。
Inside the collapsing building, he tried to take the protagonist down with him.
電車で道連れとなった二人は、生涯の友となった。
The two who became travel companions on the train ended up lifelong friends.