Here's the breakdown:
* Purpose: It was designed as a motivational poster by the British government's Ministry of Information to boost morale during the war.
* Creation: It was designed by Frank Pick, a graphic designer, and likely inspired by existing posters with similar messages from the 1914-18 war.
* Target audience: The poster was aimed at the British public to help them cope with the stress and fear of war.
* Distribution: Only a limited number of the posters were printed and distributed, mainly in 1939. They were not widely seen during the war itself.
* Rediscovery: The phrase fell into obscurity after the war but was rediscovered in 2000 when a copy was found in a bookshop in Northumberland.
* Popularity: Its simple message resonated with people, leading to its widespread popularity in the 21st century, being printed on mugs, t-shirts, and other merchandise.
It's important to note that the phrase has undergone a significant shift in meaning over time. While originally intended as a wartime slogan, it is now often used as a general reminder to stay positive and resilient in the face of challenges.