Shirr is a verb that means to gather or draw up fabric, usually by running a length of elastic or thread through the material. There are several synonyms for this word, including shirring, smocking, and gathering. These words are all used to describe a similar technique of creating a gathered effect in fabric, which is often used in clothing, home decor, and other textiles. Other possible synonyms for shirr might include cinching, puckering, or ruching, which all describe a similar gathering or pleating effect in fabric. Ultimately, the choice of synonym will depend on the specific technique being used and the effect that the designer or creator is trying to achieve.