on the sly

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Definitions from WordNet

Adverbial on the sly has 1 sense

furtively, on the sly - in a furtive manner; "the soldiers were furtively crawling through the night"

Definitions from the Web

Term: on the sly

Definition:

On the sly refers to doing something secretly or without others noticing.

Examples:

Adverb:

1. She took a few cookies from the jar on the sly.

2. He managed to collect information on the sly without anyone suspecting.

Phrase:

1. They planned a surprise party for their friend on the sly.

2. The spies communicated on the sly to avoid being detected.

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on the qui vive on the quiet on the road on the ropes on the run on the set on the short term on the side on the sly on the spot on the spur of the moment on the strength on the strength of his looks alone on the table on the trot on the verge on the wagon

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