What is the meaning of the word "gain vigor"?

Definitions:

  1. To become more active, dynamic, or effective. copy to clipboard VERB
    • The movement gained vigor as more people joined the cause. copy to clipboard
  2. To increase in physical strength, energy, or robustness. copy to clipboard VERB
    • After a few weeks of rest and proper nutrition, he began to gain vigor. copy to clipboard

Synonyms: