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Knuckle their foreheads

Posted by Noelani on July 02, 2005

Hi everyone, please help. My friend and I had a discussion today about the fact that old time sailors used to Knuckle their foreheads rather than use the present day form of saluting. I know this is not a phrase but I just dont know where else to look and I feel certain that somebody out there will know the origin of this old custom and will hopefully be willing to share it. Thanks