to move on, doubtful
冘 centers on a state of hesitation or uncertainty: being doubtful, wavering, or moving forward only tentatively. The idea of "to move on" is tied to this hesitant, uncertain progress.
The historical origin of 冘 is uncertain. It may have originally depicted a person walking hesitantly, but the exact development is unclear.
The top 冖 looks like a cover or weight pressing down, and the lower part suggests a person or movement. Imagine someone trying to move forward but held back by a heavy cover, making them doubtful and hesitant.
For イン, picture a person hesitating at an inn door, unsure whether to enter: inn -> イン, and the doubt keeps them from moving on.