Definition of "interject"

He roared with prodigious violence against George the Second. When he ceased, Moody interjected, in an Irish tone, and with a comick look, “Ah! poor George the Second.”

1791, James Boswell, “(please specify the year)”, in The Life of Samuel Johnson, LL.D. […], volume I, London: […] Henry Baldwin, for Charles Dilly, […], pages 474-475

‘Please, sir, Richard says one of the horses has got a very bad cold, and he thinks, sir, if you could make it convenient to go the day after to-morrow, instead of to-morrow, he could physic it to-day, so as—’‘Confound his impudence!’ interjected the master.

1848, Anne Brontë, “Chapter 24”, in The Tenant of Wildfell Hall‎

As I listened I interjected an occasional sentence of Japanese translation for our guests.

1934, Olaf Stapledon, “East is West”, in Sam Moskowitz, editor, Far Future Calling: Uncollected Science Fiction and Fantasies of Olaf Stapledon‎, published 1979

Virenque, in a panicky mishearing, replied, “Me a dealer? No, I am not a dealer.” […] Whereupon Virenque’s lawyer interjected, “No, Richard, the judge said leader. It’s not an offense to be a leader.”

21 August 2000, Julian Barnes, “The Hardest Test: Drugs and the Tour de France”, in The New Yorker‎