After months of public protests, the politician finally announced his resignation.

protests 是名词 protest 的复数形式，protest 的意思是"抗议、反对"，指人们公开表达不满或反对意见的行为。 在句中，public protests 指"公众抗议活动"，即民众通过集会、游行等方式表达对政府或官员的不满。