
While you’re/I’m etc. at it
Opportunity
Use this phrase to suggest an additional action that can be easily done at the same time.

Since you're going to the post office, while you're at it, could you mail this letter for me?
Convenience
It indicates doing something extra because it requires little effort or deviation from what's already being done.

I'm going to wash the car; while I'm at it, I might as well clean the bike too.
Colloquial
This phrase is common in casual conversation but may be too informal for formal writing or speeches.

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