on the sly


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Related to on the sly: get on, fall apart, catch up, stay put, turn up, called off

on the sly

Fig. secretly and deceptively. She was stealing little bits of money on the sly. Martin was having an affair with the maid on the sly.
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on the sly

secretly She's been going out with him on the sly.
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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]
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on the sly

mod. secretly and deceptively. She was stealing little bits of money on the sly.
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on the sly

In a way intended to escape notice: took extra payments on the sly.
See also: on, sly