A twitch is a sudden movement or spasm, often small and involuntary. You might see a twitch in someone's eye or muscle.
When people talk about twitches, they usually mean physical movements that happen without being fully controlled. For example, if you're sitting still, watching TV, and your leg suddenly jerks up for no reason, that's a twitch. Sometimes these movements are so small they almost go unnoticed, but other times they can be quite noticeable. If someone is stressed or anxious, they might talk about having a "twitchy" feeling – like their body is just on edge and ready to jump into action at any moment. Some people also use the word twitch to describe nervous energy or restlessness.
Couch grass (Elymus repens; a species of grass, often considered as a weed)
