Board Thread:Questions and Answers/@comment-16680724-20190210043351/@comment-4651179-20190210062312

What Kate is correcting is not the entirety of the word but the second half. This means that Clint meant to say "cumberbund" (an alternate spelling of "cummerbund"). It's a piece of clothing that is a waist sash. Kate only said "bund" instead of "cumberbund" because the first half was correct.

As for Cumberbatch, it's a British surname. The most prominent person with this surname is actor Benedict Cumberbatch.