Crossword clues for the word: KNOWSONESONIONS The word KNOWSONESONIONS has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for KNOWSONESONIONS Showing 1 to 9 of 9 results Clue(s) "Has proficiency, slangily" Has expertise Has the material mastered Identifies certain grocery items. Is a pro Is adept Is highly skilled: Slang. Is highly versed about something Is well-versed in a subject