When the terminal text reaches the bottom of the window, it's hard to see underscores and font descenders since they're so close to the window border.
Can I configure a blank line (or 2)?
You could output the terminal control codes ("ANSI codes:, "xterm control codes") to go one line down (scrolling the terminal up by one line when in the last line) and one line up again.
Should be done when the prompt is shown - or possibly as part of the prompt (try this first).
Regarding terminal codes and how/where to output: here's a more complex question - showing something in the line below: