smirk
verb (used without object)
to smile in an affected, smug, or offensively familiar way.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Now, even those in the crowded restaurant who had been smirking when he started his story had put down their beers and were listening.
From The Report on Unidentified Flying Objects by Edward J. Ruppelt