to dawdle, the name of the father of the Emperor Yao
夌 is a rare kanji with two distinct meanings that do not share an obvious conceptual center: one is 'to dawdle' or linger, and the other is a proper name referring to the father of the legendary Emperor Yao. Its standalone meaning is unclear outside these specific contexts.
The historical origin of 夌 is uncertain. It combines 圥 (top) and 夂 (bottom), but the exact development and original meaning are unclear.
The top 圥 looks like a person lingering on a mound, and the bottom 夂 suggests slow movement, like someone dawdling. For the name meaning, remember it as a specific historical figure.
For リョウ, imagine someone dawdling so long that they miss the last train and have to stay at a ryokan (旅館, りょかん): ryokan -> リョウ, and the dawdler is stuck there.