<p>Haha it’s like Dart-mu-th
the mu is like uhh with an m before it. :)</p>
<p>hope that makes sense. lol.</p>
<p>Or just check out this link to hear it 
[Merriam-Webster</a> Pronunciation](<a href=“http://mw1.merriam-webster.com/cgi-bin/audio.pl?ggdart02.wav=Dartmouth]Merriam-Webster”>http://mw1.merriam-webster.com/cgi-bin/audio.pl?ggdart02.wav=Dartmouth)</p>