[willyt]

That is a common usage in British English as well. E.g “I will update the draft document and revert back to you”.

One of the most annoying things about Duolingo is that they haven’t spared a week of an intern’s time to come up with a way of substituting the British/Indian/Irish/Austrailian/New Zealand/South African… word for the American English word. OK there’s a lot of slang out there and you could really go down a rabbit hole but when the usage is well documented in e.g. Collins-Robert there’s no excuse really.