Ur means to awake, stir up, rouse, or be aroused. It appears about 80 times. It describes waking from sleep, stirring up one's spirit, rousing to action, and God awakening His power on behalf of His people.
The cry 'Awake, O LORD!' (Psalm 44:23) expresses urgent dependence on God's intervention. God stirs up the spirits of leaders (Ezra 1:1 — Cyrus), awakens His people from spiritual slumber, and rouses His mighty arm to deliver. The call to awaken is a call to divine action.