Crossword clues for the word: GTBR The word GTBR has appeared as an answer to at least 8 crossword clues on different crossword puzzles. Crossword clues for GTBR Showing 1 to 8 of 8 results Clue(s) Europe's largest island: Abbr. Member of the Allies in W.W. II: Abbr. Most of the U.K. Much of the U.K. Part of the U. K. Political union created under Queen Anne (abbr.) Principal island of the U.K. U.K.