INDULGE IN MOCKERY is an expression that means to make fun of someone or something in a mocking manner. The two crossword solutions for this term are JAPE and JEER, both four letters long. JAPE is defined as to joke or make fun of someone in a lighthearted way, while JEER is defined as to mock or ridicule someone in a contemptuous manner. Therefore, INDULGE IN MOCKERY can be interpreted as making fun of someone or something in either a lighthearted or contemptuous way.