They were finally able to ________ after a long disagreement.
The question asks to fill in the blank in the sentence: "They were finally able to ________ after a long disagreement." The correct phrase to complete this sentence is "bury the axe".
The idiom 'bury the axe' means to end a quarrel or disagreement and become friendly or reconciled. It signifies making peace after a conflict. In the context of the sentence, "after a long disagreement," this idiom fits perfectly, suggesting that the parties involved have decided to stop arguing and move forward amicably.
Let's look at why the other options don't fit the context:
Considering the meaning of each idiom, 'bury the axe' is the only one that accurately describes the action of ending a long disagreement and making peace.
Therefore, the completed sentence reads: "They were finally able to bury the axe after a long disagreement."