probably from H1856 with a prepositional prefix; by stabbing, i.e. assassin; Bidkar, an Israelite; Bidkar.
Usages throughout the bible
2 Kings 9:25
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Then said Jehu to Bidkar H920 his captain, Take up, and cast him in the portion of the field of Naboth the Jezreelite: for remember how that, when I and thou rode together after Ahab his father, the LORD laid this burden upon him;