プルーフ
プ
ル
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フ
Meanings
1
Used for the alcohol proof scale, especially in imported liquor contexts.
This whiskey is 80 proof.
2
Appears in compound loanwords such as ウォータープルーフ (waterproof). Rarely used as a standalone noun.
This watch is waterproof.
3
A trial print for checking before final printing. The Japanese term 校正刷り is more common.
See also: 校正刷り
The designer checked the proof before printing.
4
General sense of evidence or verification, often in technical or formal contexts. 証拠 is the common Japanese equivalent.
That theory needs solid proof.