The crossword solution for the term COMMON QUOTE TAG is 'SHAK', which is an abbreviation of the name William Shakespeare. Shakespeare was an English poet, playwright, and actor who is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often quoted in literature, films, and everyday conversation, and his works are some of the most frequently performed plays in the world. The term 'SHAK' is commonly used as a tag to refer to quotes from his works.