A partisan is a strong supporter of a person, group, or cause, often showing a bias for one side. Historically, it can also mean a member of a resistance group fighting against an occupying force.
From French 'partisan', from Italian 'partigiano', from 'parte' meaning 'party' or 'side'. It originally meant someone belonging to a particular political faction.
A partisan is literally a 'party person'—someone who has picked a side and sticks to it. The word warns you that passion for a cause can slide into tunnel vision if you’re not careful.
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