There are various synonyms for the phrase "tie to," which refers to the act of connecting or linking something to something else. Some common synonyms include bind, fasten, attach, secure, tether, couple, yoke, and unite. These words can be used interchangeably in different contexts, such as tying a rope to a tree, fastening a belt around a waist, attaching a document to an email, or coupling train cars together. Overall, these synonyms help to emphasize the idea of establishing a connection or bond between two things, whether it be physical or metaphorical.