affirmative response, relaxed, at ease
兪 centers on a relaxed, affirmative state: being at ease and responding positively. The idea connects a calm, unhurried acceptance with a simple yes.
The exact historical origin of 兪 is uncertain. It may have originally depicted a boat or vessel, with later associations to ease and affirmation, but the component development is not clearly established.
The top 亼 looks like a roof or gathering, and the bottom 巜 resembles a relaxed, winding waterway. Picture a person under a roof by a gentle stream, completely at ease and nodding yes.
For ユ, imagine a relaxed person saying 'you' in a calm, affirmative tone: 'Yes, you.' The word 'you' cues ユ while the scene stays easy and positive.