peaceful, cheap, grab strap
綏 centers on a state of calm stability: peaceful, settled, or secure. The 'cheap' and 'grab strap' senses are unusual and may reflect specialized or archaic uses that do not clearly connect to the core idea of peace.
綏 combines 糸 (thread) with 妥, which likely contributes the sound and the idea of settling or pacifying. The exact historical development is uncertain, but the character is associated with peace and stability, possibly through the image of a restraining cord or a settled state.
Thread 糸 wrapped around a settled woman 妥 suggests tying things down to keep them peaceful and secure.
For スイ, imagine a peaceful scene where a swan glides on a calm lake: swan -> スイ, and the thread-like ripples settle everything into peace.
lulled into peacefulness; comforted and consoled