Pocketbook
来自Big Physics
wiktionary
"1610s,[ [1]] originally a small book meant to be carried in one's pocket, from pocket (n.) + book (n.). Meaning 'a flexible booklike leather folder for papers, bills, etc.' is from 1722. Meaning 'a woman's purse' from 1816." [2]
From pocket + book, popularized in its sense as a paperback by the success of Pocket Books in the United States after its 1939 launch.
etymonline
pocketbook (n.)
also pocket-book, 1610s, originally a small book meant to be carried in one's pocket, from pocket (n.) + book (n.). Meaning "a flexible booklike leather folder for papers, bills, etc." is from 1722. Meaning "a woman's purse" is from 1816.
