He gave her a 'smoldering' look. [=he looked at her in a very sexy way]
Their discontent 'smoldered' [='simmered'] for years.
The remains of the campfire 'smoldered'.
(..) ever break that promise. EVER! All right, listen, I didn't want to have to want to do this, but you leave me no choice. Here comes the 'smolder'. This is kind of an off day for me. This doesn't normally happen. Fine, I'll take you to see the lanterns. Really! -Ooops. -You broke my 'smolder'. You coming, Blondie? *Look at the world so close, and I'm half way to it* *Look at it all, so big do I even dare?* (..)2010 Tangled