A more thorough explanation:

Definition: To make up or fabricate; to make a false show of.

Example: She feigned interest in his story, but was actually bored.

Explanation: In this example, the person is pretending to be interested in the story, but in reality, they are not. They are making a false show of interest.

Example: He feigned surprise when he saw the surprise party, even though he knew about it all along.

Explanation: In this example, the person is pretending to be surprised when they see the party, even though they knew about it beforehand. They are making a false show of surprise.