register, record book
簿 centers on a written log for systematic tracking: a register or record book used to keep official accounts.
簿 combines 竹 (bamboo, used for writing tablets) with 溥, which likely contributes the sound ボ and the idea of spreading or covering, suggesting a broad written record.
Bamboo 竹 tablets bound together form a register; the bottom part 溥 looks like a spread-out record with water 氵, a field 田, and a hand 寸 keeping things in order.
For ボ, imagine a bow-tied register book: bow -> ボ, and the bamboo cover keeps the records neatly bound.
—
register of names; list of names; roll; register; roster
register; record book
bookkeeping
account book; register; ledger
list of passengers; passenger manifest; passenger register
subscription list
case file
(illegal) dual bookkeeping; two sets of books
directory; name list
membership list
account book; book of account; ledger
account book
list of candidates; slate; list of nominees
public record; public register; official records
employee's attendance record
attendance record
cashbook
single-entry bookkeeping
ledger; original record; register
drug master file; DMF