drawstring
noun [ C ] uk/ˈdrɔː.strɪŋ/ us/ˈdrɑː.strɪŋ/
（尤指口袋封口或衣服收腰用的）拉绳，拉带，束带
a thread or string that goes through an opening, especially in the top of a bag or the waist of a piece of clothing, and can be pulled to fasten it or make it tighter