jacob: (Old Testament) son of Isaac; brother of Esau; father of the twelve patriarchs of Israel; Jacob wrestled with God and forced God to bless him, so God gave Jacob the new name of Israel (meaning `one who has been strong against God')
causal agent: any entity that produces an effect or is responsible for events or results
straight-arm: (American football) the act of warding off a tackler by holding the arm fully extended with the hand against the opponent