Explanation

• The phrase "as was his wont" is an idiomatic expression that means "as was his habit" or "as usual".
• It is used to indicate that someone did something in a way that was typical or characteristic of them.
• So, the sentence "He went to his friend's house in the evening as was his wont" means that he went to his friend's house in the evening, which was his usual or habitual practice.