在英语中，"探望"的意思是"to visit (someone) for the purpose of seeing and talking to them, especially in their home."

"探望我爷爷"可以用以下几种方式表达：

"visit my grandfather"
"pay a visit to my grandfather"
"go see my grandfather"

举几个例子：

I'm going to visit my grandfather this afternoon. (我下午要去探望我的爷爷。)
I need to pay a visit to my grandfather at the nursing home. (我需要去养老院探望我的爷爷。)
I'm going to go see my grandfather and bring him some flowers. (我要去探望我的爷爷，并带给他一些花。)

"Visit"是英语中最常用的表示"探望"的动词。它来源于拉丁语"visitare"，意思是"观看，检查，拜访"。