One way to hold this word: a sheet of soft paper that drinks. Put something wet on it and the paper takes it in and keeps it — the ink stays in the paper instead of running across the desk. That is the whole trick, and the word follows the trick rather than any one object. Change the liquid and the same paper does the same job under a new name: ink on a desk, perfume at a shop counter, a drug in liquid form. And because that sheet lay in the middle of every working desk, the running record kept beside it on the counter took the name too.
From the word’s history
Wiktionary gives the make-up of the word directly: blot plus -er, the ending that names the thing that does something. So the word literally says 'the thing that blots' — the thing that takes up a wet mark — which is exactly the picture every sense still uses.
依 Wiktionary，這個字的組成很直接：blot（墨漬、吸掉墨水）加上 -er（做這件事的東西）。字面上就是「負責吸掉墨漬的那個東西」。這正好就是每個意思底下都還在用的那張畫面。
Wiktionary (kaikki:3f6f69a190036ae4:917704631): From blot + -er.
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