One who crosses; a person or animal that crosses from one place to another, or in botany, an organism that is crossed with another.
From 'cross' (Old French 'crois') + '-er' (agent suffix). This general term can apply to any entity making a crossing movement or participating in crossing.
Border crossers and river crossers in history have shaped civilization—the Bering Land Bridge crossers populated the Americas, while repeated crossers of the Silk Road spread technology, religions, and ideas across Asia and beyond!
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