sunk
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
Already incurred and irrecoverable, and therefore irrelevant to future decisions.
The money spent on the abandoned prototype was sunk and had no place in the reinvestment appraisal.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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