Select the most appropriate meaning of the underlined idiom in the given sentence.

The friends quarrelled some time ago but now they are trying to make up with each other.

to settle their differences

The most appropriate meaning of the underlined idiom "make up" in the given sentence is to settle their differences.

The other options are incorrect.

• "To part forever" is not the same as make up. Parting forever means to break up and never see each other again, while make up means to resolve a disagreement and become friends again.
• "To blame each other" is not the same as make up. Blaming each other means to assign fault to the other person, while make up means to forgive each other and move on.
• "To compete with one another" is not the same as make up. Competing with each other means to try to win against each other, while make up means to put aside your differences and work together.

The idiom "make up" comes from the idea of putting two things together that have been broken apart. In the same way, when two people make up, they are putting their relationship back together after a disagreement.