"I must confess" is a phrase that indicates admission or disclosure of a truth. There are many synonyms for this phrase that can be used to convey the same meaning. Some examples of synonyms for "I must confess" are "to be honest," "truth be told," "confession time," "let me admit," "I have to admit," "to tell you the truth," "frankly speaking," "in all honesty," and "I confess." These phrases are commonly used in conversations and writings, where the speaker wants to express their truthfulness and honesty about a particular matter. Using synonyms for "I must confess" can provide variety to your language and can help you sound more articulate and expressive.