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

You better gird up your loins as we are going to meet my family.

To prepare oneself for a difficult situation

The most appropriate meaning of the underlined idiom "gird up your loins" in the given sentence is to prepare oneself for a difficult situation.

The other options are incorrect.

• "To earn more money" does not mean to prepare oneself for a difficult situation. Earning more money is about improving one's financial situation.
• "To look smart and charming" does not mean to prepare oneself for a difficult situation. Looking smart and charming is about making a good impression.
• "To ask for someone's help" does not mean to prepare oneself for a difficult situation. Asking for someone's help is about getting assistance from another person.

The idiom "gird up your loins" comes from the Bible, and it means to prepare oneself for action. In the context of the sentence, it means that the speaker is telling the listener to prepare themselves for meeting their family, which is likely to be a difficult situation.