thump
noun
a blow with something thick and heavy, producing a dull sound; a heavy knock.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
First he seemed kind of flustered and angry and I know Pee-wee's heart was thumping-anyway it would have been thumping, except that it was up in his throat.
From Roy Blakeley by Percy Keese Fitzhugh