Underline multi-line text field ?

I have created a document ,concretely a brief ,for my customers, and there are some field they have to fill upon hiring me ,but some of them are like 3 or 4 lines of text. I created a big text field ,but all I get is an empty box ,when I want it to show every line underlined ,you know what I mean, it's possible with single lined text boxes as I check the Line style to be underlined ... Is it possible to do this in acrobat ?