The idiom "bit off more than can chew" implies one has taken on more than they can handle. There are numerous synonyms for this phrase, such as "overextended oneself," "pushed the envelope," "stretched too thin," "out of one's depth," "in over one's head," and "bitten off more than one can swallow." These phrases elicit the feeling of being overwhelmed and exhausted by the amount of work that needs to be done, and can also indicate poor judgment or a lack of knowledge. These synonyms can be used interchangeably in various contexts, whether in personal or professional situations where one has over-committed or cannot meet their obligations.