Etymology
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dashboard (n.)

also dash-board, 1846, "board or leather apron in front of a carriage to stop mud from being splashed ('dashed') into the vehicle by the horse's hoofs," from dash (v.) + board (n.1). Of motor vehicles, "panel under the windshield, on which control panels and gauges are mounted,” by 1904. Except for the situation relative to the front seat, it has nothing in common with the original.

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Definitions of dashboard

dashboard (n.)
protective covering consisting of a panel to protect people from the splashing water or mud etc.;
Synonyms: splashboard / splasher
dashboard (n.)
instrument panel on an automobile or airplane containing dials and controls;
Synonyms: fascia
From wordnet.princeton.edu