marginal seal; approval seal in the margin
A seal stamped in the margin of a contract or official document in advance, to validate later handwritten corrections or additions without needing a new seal each time.
using up leftover ink on a seal
The act of pressing a seal onto scrap paper to remove excess ink after inking, so the next impression is clean. Less common than the marginal seal sense.
If you stamp a marginal seal on the contract in advance, it's convenient when you need to make corrections later.
I put too much ink on the seal, so I blotted it on scrap paper before stamping the document.
Standard kanji spelling.
Variant spelling without okurigana; less common but still used.
From 捨てる and 印. It denotes a seal stamped in advance in a document’s margin to authorize minor later corrections without requiring the signer to stamp it again.