Feel free to let me know if this gets irritating .
cough , cough , cough-jet-cough-lover , cough ......
HANKY-PANKY : British Master Magicians would use fast movements of a handkerchief to distract viewers from noticing what they were doing with the other hand . A rhyming word was added and presto ! A new word for undercover doings .
GREAT SCOTT: The exclamtion , picked up by civilians , came from a very disliked and vain Winfield S. Scott who was a long time commander of the U.S. Army .
ACE IN THE HOLE : Originated from stud poker where a lucky player sometimes holds an ace , concealed face down , to turn the game in their favor . Expanded to any source of strength kept secret by it's holder .
BACK TO SQUARE ONE : Borrowed from board games where all players start a new game on the first square as a starting point .
BLUE CHIPS : The colored poker money that outranks both red and white chips lends it's theory to stock market investors who put their money in, what they consider , the most valuable stocks.