Definition of churrs:
(n) :
A low vocal sound made by some birds.
(v) :
To make the low vocal sound of some birds.
(n) :
Alternative spelling of chirr (“insect sound”). [The trilled sound made by an insect.]
(v) :
Alternative spelling of chirr (“to make an insect sound”). [(intransitive) To make the prolonged trilling sound of an insect (e.g. a grasshopper, a cicada).]