Curve bottom line of text, not top or sides.

Using illustrator CC, I want to curve the bottom line of my text upwards, but not have the top or sides move at all.  Imagine of the text was something squishy, and I pushed it down onto the top of an arc.    Sorry if this is a really simple thing, but I've only been working with Adobe CC for about a week now.  I've seen lots of examples of having the text follow a curved path, but they all curve the entire thing, whereas I only want the bottom of the text to curve.