Question

go a bundle on

Accepted Answer

be very keen on or fond of - British informal

In this idiom, bundle is being used in the late 19th-century US slang sense of a bundle of money, i.e. a large sum. To go a bundle on was originally early 20th-century slang for betting a large sum of money on a horse.

1968 - Adam Diment - Bang Bang Birds - I don't go a bundle on being told I'm a pro. be very keen on or fond of - British informal

In this idiom, bundle is being used in the late 19th-century US slang sense of a bundle of money, i.e. a large sum. To go a bundle on was originall

Bundle Slang Large Keen Fond British Informal Idiom