to tuck in, to put the finger into, to put in, to stow away
擪 centers on the action of pressing or tucking something in with the fingers, especially putting a finger into something or stowing an object away by pressing it into a confined space.
擪 combines 厭 (press down, suppress) with 手 (hand), suggesting the action of pressing or tucking with the hand. The exact historical development is uncertain, but the component relationship is consistent with the meaning.
The outer part 厭 looks like a heavy lid pressing down, and inside is 手, a hand. Imagine using your finger to press something small into a tight spot, tucking it away under pressure.
For ヨウ, picture using your finger to tuck a yo-yo string into a narrow gap: yo -> ヨウ, and your hand presses it in.