What is ment by the term Hidden Kiss in Peter Pan?

In the play and novel "Peter Pan" by J.M. Barrie, the term "Hidden Kiss" refers to the kiss that Wendy gives to Peter Pan when he accidentally falls asleep in her bed before he leaves for Neverland. However, the term "Hidden Kiss" does not appear explicitly in the original text; instead, it is derived from the context and interpretations of the scene.