Apparently fromhappen +chance, perhaps influenced byhappenstance.
happenchance (countable anduncountable,pluralhappenchances)
- (informal, originally regional)Coincidence.
1955, Henry van der Schalie, quoting Goodrich, “Calvin Goodrich, 1874-1954”, inUniversity of Michigan Summer Session 1955 Announcement[1], page12:It may be that some day I will find a respectable population of shells, but that will be merehappenchance.
happenchance (notcomparable)
- Characterized byhappenstance;chance;fortunate orunfortunate.
2017, Iain MacKenzie,Irenaeus's Demonstration of the Apostolic Preaching[2], page142:The advent of the Son in the flesh is nohappenchance occurrence: it has a hinterland of deliberate and necessary preparation.
, Oxford:Oxford University Press, December 2013.