Definition of mizzles:
(v) :
(intransitive, British, Canada, US, chiefly dialectal) To rain in very fine drops.
(n) :
(British, chiefly dialectal) Misty rain; drizzle.
(n) :
A mist; a fine spray; a spattering.
(v) :
(chiefly British) To abscond, scram, flee.
(v) :
(intransitive) To yield.
(v) :
(transitive) To muddle or confuse. (Probably from a misreading of past tense/participle misled.)