chuck in
Upper Intermediate (B2)informal
To include something extra for free, or to stop doing a job or activity you've been doing
"If you buy the laptop today, we'll chuck in a free mouse and keyboard."
Hear it in context

The BIGGEST VAR decision EVER? | Monday Night Club | 11 May
BBC Sport · 83:52
great But presumably if you chuck in chuck in Champions

Jeremy, Richard and James Find the BEST Four-seat Supercar | Top Gear Classic
Top Gear Classic · 4:54
Chuck in [music] a windscreen wiper.

He Needs a NAS
Linus Tech Tips · 10:14
Pretty sure you can also just chuck in kind

What's the next freak identity? A new deep connection with Sophie Germain primes
Mathologer · 2:18
Just chuck in another 1 :)1 on the right.

EVERY PRIDE FC Event from 2003! | Full Events MARATHON
UFC FIGHT PASS · 508:27
are you going to take Chuck in that one?