Idaho Code § 18-901: Assault defined.

An assault is:

(a) An unlawful attempt, coupled with apparent ability, to commit a violent injury on the person of another; or

(b) An intentional, unlawful threat by word or act to do violence to the person of another, coupled with an apparent ability to do so, and doing some act which creates a well-founded fear in such other person that such violence is imminent.