ichidan verb, transitive verb
talk on and on; rattle on; keep talking without pause
Describes speaking rapidly and at length, often in a one-sided or forceful manner, without letting others interrupt.
彼は自分の意見をまくし立てて、誰にも口を挟ませなかった。
He rattled on about his opinions and didn't let anyone get a word in.
電話で友達がまくし立てるので、なかなか切れなかった。
My friend kept talking on and on on the phone, so I couldn't hang up easily.