squeak
noun
a short, sharp, shrill cry; a sharp, high-pitched sound.
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.
In the plains there had been squeaking, humming, chitterings, the vocalizing of myriad grass dwellers.
From Star Hunter by Andre Norton