"Take the piss" is an idiom that is commonly used in British English to mean mocking or teasing. If you're looking for synonyms for "take the piss", there are quite a few options. Some of the most popular ones include 'mock', 'taunt', 'ridicule', 'tease', 'deride,' 'trifle with', 'jape', 'jive', 'rib', 'flout', 'jeer', 'poke fun at' and 'make fun of'. Each of these words has a slightly different connotation, so choose the one that best suits the situation. Using a synonym can help vary your vocabulary and ensure you don't get repetitive in your conversations.