cardinal rule en · NOUN
Meanings
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A fundamental rule, upon which other matters hinge.
Obviously they were well aware of the cardinal rule of being a college freshman: all's fair in innocent prankage.
2011, John Randall Tabor, Homer Is Where the Heart Is, page 132:
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| cardinal rules | Number=Plur | lexicographic |