IPA: /ˈhændlər/
KK: /ˈhændlər/
A person who is responsible for managing, training, or taking care of something, often an animal.
The dog handler trained the puppy to follow commands.
Handler → It is formed from "hand" (from Old English "hand", meaning the part of the body used for holding) and "-ler" (a suffix indicating a person who performs a specific action). The word "handler" refers to a person who handles or manages something, particularly in a practical or skillful manner.
Think of someone using their 'hand' to manage or control something — that's why a 'handler' is a person who handles.