The shrinkage of this sweater after washing was noticeable due to the high temperature.

shrinkage 是动词 shrink 的名词形式，shrink 意思是"收缩、缩水"，加上名词后缀 -age 表示"过程或结果"。shrinkage 在这里指毛衣洗涤后"缩水"的现象。