фразовый глагол 1) усердно работать Например: I haven't finished this work yet: I'll have to keep banging away at it until this evening. — Я ещё не закончил. Мне придется сидеть над этим до вечера. 2) настойчиво атаковать вопросами
intransitive verb 1. to work with determined effort Example: students banging away at their homework 2. to attack persistently Example: police are going to keep banging away at you — Erle Stanley Gardner