appeal, request, implore
籲 centers on making a heartfelt request: appealing, imploring, or calling out for something needed.
籲 combines 竹 (bamboo) with 龥, a component associated with a musical instrument or calling out. The exact historical development is uncertain, but the character likely relates to making a sound or appeal.
Bamboo 竹 over 龥, a shape that suggests a musical pipe used to call out. Imagine a bamboo flute being played to implore the heavens.
For ユ, picture you making a desperate appeal: you -> ユ, and your voice carries the request.