The Hebrew verb ga'al (H1350) means to redeem, deliver, or act as a kinsman-redeemer (go'el). The go'el was a family member who had the right and responsibility to redeem a relative's property, restore their freedom, or avenge their blood.
Few words in the Hebrew Bible are as theologically loaded as ga'al. God Himself is called Israel's Go'el — their nearest Kinsman who had both the right and the will to redeem them. The book of Ruth dramatizes this: Boaz's redemption of Ruth foreshadows the ultimate Kinsman-Redeemer, Jesus Christ, who assumed humanity in order to have the right to redeem fallen humanity from sin and death.