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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a fool or simpleton; ninny. |
on the sly definition
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sly definition
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on the sly
Furtively, secretly, as in She's always eating cookies on the sly. The adjective sly, which means "cunning" or "crafty," is here used as a noun. [c. 1800]