The phrase "level with" can mean to be honest and straightforward with someone. There are many synonyms for this phrase, including "be candid with," "be frank with," "be truthful with," "be open with," "be sincere with," and "be forthright with." All of these synonyms express the same idea of being honest and upfront with someone, especially when discussing important or sensitive topics. Using different synonyms can help add variety and nuance to your language and can make your communication more effective. By choosing the right synonym, you can convey your message clearly and build trust and rapport with the person you are speaking with.