Pronunciation: [dˈʌz ɒnðə slˈa͡ɪ] (IPA) 
The spelling of the phrase "does on the sly" may be confusing for some because of the pronunciation of the word "does." In this context, "does" is pronounced as "duz" with a voiced 'z' sound, rather than the usual pronunciation of "duhs" with an unvoiced 's' sound. The addition of "on the sly" means to do something secretly or discreetly. Overall, the phrase means to do something in a sneaky or hidden manner.
"Does on the sly" is an idiomatic expression used to describe actions or behavior that are done secretly or in a covert manner. It refers to performing a task or engaging in certain activities while deliberately concealing one's actions from others. The phrase is often used to imply that these actions are either disapproved of or frowned upon.
When someone "does something on the sly," they typically do not want others to know or observe their behaviors. This could be due to a variety of reasons, such as breaking rules, avoiding consequences, or hiding something from others. The secretive nature of the action suggests that it may not be considered moral, ethical, or appropriate.
The phrase can be used to describe various situations. For instance, one might "do something on the sly" by cheating in an exam, sneaking out of a house or workplace, stealing, or engaging in an affair. It connotes a sense of deceit or trickery, as the individual intentionally takes actions behind others' backs.
In summary, "does on the sly" refers to engaging in activities covertly or secretly, usually to conceal one's behavior from others. The phrase carries a negative connotation, suggesting actions that are hidden or done in a manner that is disapproved of or goes against accepted norms or rules.
