Posted by John Nichols on September 27, 2020 at 07:19:14 user Mcneacail.
"To be in a flap
This was a Naval expression dating from 1916 and refers to the flapping of birds, and means to be worried or excited. Later it became widely used by ground forces in WW1 and led to the term "unflappable" which appeared much later and means "marked by assurance and self-control". - BBC Tommies Site 2020 - should suffice for copyright.
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This is from Tommies site on the BBC, unfortunately I cannot listen to the broadscasts.
the definition of unflappable would be Kenneth Branagh on the end of the pier in Dunkirk. - What acting.
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