Talking non-stop or indiscreetly; chattering, often with the nuance of speaking carelessly or revealing secrets.
飲み会で彼女はお酒が入るとべらべらと喋る。
At parties, she chatters nonstop after drinking.
秘密をべらべら話すのはやめてください。
Please stop blabbing the secret.
彼は初対面でべらべら話すので、うるさく感じる人もいる。
He talks a lot when he first meets someone, which some people find noisy.
Thin or flimsy (usually for materials like fabric or paper); similar to 'perapera' in the physical sense.
そのシャツは生地がべらべらで冬には向かない。
That shirt's material is flimsy and not suitable for winter.
古いパンフレットは紙がべらべらになっていた。
The old brochure's paper had become flimsy.