Medically reviewed by Anju Goel, MD Key Takeaways Lockjaw happens when your jaw muscles tighten up so much that you can't open your mouth properly.Tetanus is a bacterial infection that can cause ...

Add Yahoo as a preferred source to see more of our stories on Google. In terms of the trend, Lockjaw essentially means being speechless, stunned, or amazed in a manner where your jaw drops. However, ...