The word "alls" is an archaic or poetic form of the word "all." In the context of the phrase "___ fair in love and war," the missing word is "fair." The full phrase is "All's fair in love and war," which means that in situations of love or conflict, any means or actions are acceptable or justifiable.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: AFTER. Explanations are generated by AI and may be inaccurate.