catch hand is incorrectly written and it should be written as "Take the hand." being its meaning: Take the hand = stop someone who is about to do something, especially, perjudiciable, incorrect or inappropriate. Help you do something for whose execution is not just enough. Stop someone on the edge of the precipitation, help someone timely.
Take your hand or take by the hand is a habit that can symbolize appreciation, friendship, protection, union, safety, love, jealousy, authority, etc.It is a form of nonverbal communication that conveys moods and personal attitudes
It is to take someone's hand