quaver
verb (used without object)
to shake tremulously; quiver or tremble.
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.
Glory's voice, which had been quavering at first, gathered strength.
From The Christian A Story by Sir Hall Caine