hamstrings Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. muscles at the back of the thigh that bend the knee. Example Sentence His hamstrings were tight after the long run. More Example Sentences Stretching the hamstrings improves flexibility. Synonyms thigh muscles; flexors Antonyms skull Hear It! Say It! Write It! hamstrings Switch to cursive Start Share with your friends: