A reduction in the portion or share something holds; to reduce a market share or proportional holding.
From 'down' plus 'share' (from Old English 'scearu', a portion). Modern business compound formed in the late 20th century during discussions of market competition.
This is a relatively modern business term that hasn't yet become standard—most companies would say 'loss of market share' rather than 'downshare.' Watch how business language constantly coins new compound words!
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