Lefthanded describes a person who uses the left hand because the right is impaired or because the left is preferred by habit. The biblical expression may also be understood as ambidextrous.
Both biblical examples concern Benjamites. Ehud used his left hand in killing Eglon and delivering Israel from Moabite tribute. Seven hundred selected Benjamites could sling stones with great accuracy despite being lefthanded.
The Hebrew phrase literally suggests a person whose right hand is impeded or lame. The source notes the striking connection with Benjamin, whose name means “son of the right hand.”