The term 'cry over spilt milk' is a proverb that means to lament or regret something that has already happened and cannot be changed. The crossword solutions for this term are OOPS (4 letters), MEWL (4 letters), MEOW (4 letters), and WHATAWASTE (10 letters). OOPS is an interjection used to express surprise, dismay, or chagrin. MEWL and MEOW are both onomatopoeic words that imitate the sound of a cat's meow. WHATAWASTE is an expression of regret or disappointment at the loss of something.