Definition of happen alongUS, literary + old-fashioned
- He was about to leave when his old girlfriend happened by.
: to occur by chance
: to come into being or occur as an event, process, or result
: to do, encounter, or attain something by or as if by chance
: in a line matching the length or direction of
: in the course of
: in accordance with : in
: forward, on
: from one to another
: in company : as a companion
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