Always remain cheerful in the face of problems
Although one would have thought that such an expression would have been coined centuries ago, probably by some robust British military type addressing either his children or his troops, it appears that the earliest known use of this phrase, sometimes shortened to 'chin up', is from the USA.
The website phrases.org.uk cites a reference in the Pennsylvania newspaper, The Evening Democrat, from October 1990 under the heading Epigrams Upon the Health-giving Qualities of Mirth:
"Keep your chin up. Don't take your troubles to bed with you - hang them on a chair with your trousers or drop them in a glass of water with your teeth."
British Parliament asks Amazon to clarify why it pays $9 million in income tax on $23 billion of UK sales.(May 20 2013) Amazon will be called back to give further evidence to members of the British Parliament "to clarify how its activities in the U.K. justify its low corporate...