wander
徘 centers on aimless movement: wandering or roaming without a fixed destination.
徘 combines 彳 (movement) with 非, which likely contributes the sound. The character expresses wandering or moving back and forth without a clear path.
The left side 彳 suggests a step or path, and the right side 非 looks like two diverging wings. Picture someone stepping back and forth between two paths, wandering without choosing one.
For ハイ, imagine a wanderer saying 'Hi!' to everyone they meet while roaming: Hi -> ハイ.