gather, collect, compile
輯 centers on bringing things together into one place or collection: gathering items, collecting scattered material, or compiling information into a unified whole.
輯 combines 車 (vehicle, cart) with 咠, which likely contributes the sound and may relate to gathering or whispering. The idea is gathering things together, perhaps originally referring to collecting carts or goods.
A cart (車) is used to gather and collect items, while the right side 咠 looks like a mouth (口) over an ear (耳), as if calling people to bring things together. Imagine a cart being loaded with contributions as someone calls out instructions.
For シュウ, picture a shoe (シュウ) being used to gather scattered pebbles into a pile: shoe -> シュウ, and the cart helps collect them all.