Select the most appropriate meaning of the given idiom.
To take after

The correct answer is To be similar in appearance.

Explanation:

The phrasal verb/idiom "to take after" means to resemble or look like an older relative, or to share similar behavioral traits, character, or appearance with them.

For example, in the sentence: "She takes after her mother; they both have the same beautiful blue eyes and love of music," it indicates a resemblance in appearance and interests.

Let's look at why the other options are incorrect:

1. "To chase someone" - The phrasal verb for chasing or pursuing someone is "to run after" or "to go after", not "to take after".
2. "To mock someone" - Mocking or mimicking someone can be described by phrasal verbs like "to take off" (mimic) or "to make fun of", not "to take after".
3. "To change sides often" - Changing sides or shifting loyalties is often called "to blow hot and cold" or "to turn coat", which is unrelated to "to take after".

Therefore, "To be similar in appearance" is the most appropriate meaning of the given idiom.