In the 1990s, an American teacher in London noticed the rise of British terms in American language after the Iraq war. This sparked the creation of the blog “Not One-Off Britishisms” in 2011, chronicling the phenomenon. Examples include the adoption of “run-up” and “bits”. “Bits” refers to “part” in the US and was popularized in the 90s and 2000s. Another interesting term is “cheeky”, once a British concept, now a common American term. “Clever” also has different meanings in the US and the UK. “Early days” signifies the early stages, a British expression that has made its way into American language over time.
https://www.theguardian.com/science/2024/sep/26/other-british-invasion-how-uk-language-conquered-the-us