bang on

Definition from Wiktionary, a free dictionary

[edit] English

[edit] Preposition

bang on

1. (idiomatic, British) Exactly at

   I managed to arrive bang on five o’clock.

   She’s bang on the dot, as usual.

[edit] Verb

to bang on (third-person singular simple present bangs on, present participle banging on, simple past and past participle banged on)

1. (idiomatic, British) To constantly talk about

   I started recycling, just so she’d stop banging on about it to me.