in on
idiom
: knowledgeable about (something) or involved in (something)
They were all in on the scheme.
I let them in on our little secret.
Examples of in on in a Sentence
Recent Examples on the Web
The broad area of high pressure will shift east through the day as southerly winds begin flow in on the western side of the high.
—
Mary Wasson, Austin American Statesman, 14 Jan. 2026
Guest stars like David Arquette and Tiffany Haddish will also join in on the fun this season.
—Sarah Scott, Parents, 14 Jan. 2026
Arvidsson has settled in on the second line next to Zacha and Casey Mittelstadt to the point that coach Marco Sturm trusts the trio in matchup situations.
—Fluto Shinzawa, New York Times, 14 Jan. 2026
Now, Strauss is letting people in on what that reality truly looks like, beyond the medical jargon and the milestone charts.
—Ashley Vega, PEOPLE, 14 Jan. 2026
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Cite this Entry
“In on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20on. Accessed 20 Jan. 2026.
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