collateral challenge
C1CEFR level
75/100Rarity: rare
TechnicalRegister
An attack on the validity of a decision raised in separate proceedings rather than by direct appeal or review.
The defendant mounted a collateral challenge to the byelaw as a defence to the prosecution.
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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