1. Botany:
* A small branch of a tree or shrub. This is the most common meaning. It's a slender, woody shoot that grows from a larger branch.
* A small shoot growing from the main stem of a plant. This meaning can also be used for non-woody plants like herbs.
2. Figurative:
* To understand something, especially after it has been explained. Example: "I finally twigged what he meant."
* To notice something. Example: "I twigged her new haircut."
3. Slang:
* To leave, depart, or escape. Example: "I'm going to twig out of here before things get crazy."
The meaning of "twig" will be clear based on the context of the sentence it's used in.