Where did hit it off come from?

The phrase "hit it off" is believed to have originated in the early 20th century, likely deriving from the idea of two people striking a positive connection or rapport, akin to a successful interaction or "hit." It may have roots in the slang of the time, where "hit" referred to a strong or favorable impact. Over time, it has become a common expression used to describe an instant bond or chemistry between individuals.