the.com/warble

a song that refuses to walk in a straight line.

means To sing or speak with a trilling, quavering tone, the pitch wobbling sweetly up and down like a bird's call.

from From Old North French 'werbler,' to sing with trills, which traces back to a Frankish root related to 'wirbil' meaning whirlwind or whirl — so the word carries the sense of a sound spinning and turning, never holding still. A cousin of 'whirl' and 'warp' lives somewhere in that same swirling family.

origin
From Old French werbler, meaning to trill or quaver
bird brain
Songbirds learn warbles like babies learn speech
two-throated
Some birds sing two notes at once mid-warble
dark twin
A warble fly larva burrows under mammal skin
audio sin
Pitch warble ruins vinyl and tape recordings
for instance

northern mockingbird — can produce over 200 different song types, mimicking other bird species across north america

wood thrush — produces ethereal warbling songs with two simultaneous frequencies in eastern us forests

nightingale — legendary for its complex, loud warbling song across europe and western asia

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