act on

verb4

1. •
   To act decisively on the basis of information received or deduced.

   • The policeman decided to act on the tip from his informant.
2. •
   To act accordingly to a (usually sublimated) desire or impulse.

   • He keeps telling me about wanting to make a move, but he hasn't worked up to acting on it yet.
3. •
   To affect something.

   • Different drugs act on different parts of our body in many different ways.
4. •
   To take action against something.

   • World leaders have repeatedly stated that we must act on climate change.