In this context, to "slow down" is to lose energy and vitality due to advancing age. - My dog is 15 years old, but she is just starting to slow down. - Your grandfather is 80, but he doesn't seem to be slowing down.

The phrase could carry several meanings: 1. To experience a reduction in speed, strength, agility, or mental capability. - Since the trio in question are animals, the Hedgehog could mean that the Lion, Tiger, and Bear cannot move as quickly as before, are less strong, and/or are less mentally quick. 2. To experience a reduction in pace of life. Explanation: This second meaning naturally follows from the first. Because the trio of animals are older now, the Hedgehog could also mean they are not able to enjoy or carry out whatever activities they did in the past with as much zest as before, and must settle for a slower daily routine henceforth. In this context, it is most likely that the phrase 'slow down' contains both meanings at once. Happy learning!

Sorry, the trio are a lion, a tiger and a bear.