The term 'Shakespearean Oath' is a reference to an oath taken by characters in William Shakespeare's plays. The two crossword solutions for this term are 'FIE' (3 letters) and 'SDEATH' (6 letters). 'FIE' is an interjection used to express disapproval or contempt, while 'SDEATH' is an archaic spelling of the word 'sdeath', which is an exclamation of surprise or dismay. Together, these two words form an oath that is often used by characters in Shakespeare's plays.