to talk nonstop, to talk someone's ear off
Não aguento mais meu colega de trabalho, ele não para de falar pelos cotovelos!
I can't stand my coworker anymore, he won't stop talking my ear off!
To falar pelos cotovelos (literally "to talk through the elbows") paints the chatterbox who never falls silent and whose words spill out not just from the mouth but through wildly waving arms, elbows flying as the talk pours on. Another reading links it to the habit of nudging a listener's elbow to hold their attention while rattling away.
Source: Ciberdúvidas da Língua Portuguesa.
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