let in on

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Allow someone to know about or participate in something, as in I'm going to let you in on a little secret. This idiom was first recorded in 1904.

QUIZ

GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!

Test how much you really know about regular and irregular plural nouns with this quiz.

Question 1 of 9

Which of the following nouns has an irregular plural form?

Words nearby let in on

Just the hard-on before you shoot unarmed members of the public.
'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
Three on-the-record stories from a family: a mother and her daughters who came from Phoenix.
I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003|Vicky Ward|January 7, 2015|DAILY BEAST
You just travel light with carry-on luggage, go to cities that you love, and get to hang out with all your friends.
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It was a brick wall that we turned into the on-ramp of a highway.
Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST

Could the (thus far) timid trembling give way to a full-on, grand mal seizure?
26 Earthquakes Later, Fracking’s Smoking Gun Is in Texas|James Joiner|January 7, 2015|DAILY BEAST
Such throats are trying, are they not?In case one catches cold; Ah, yes!
Boys and Girls Bookshelf; a Practical Plan of Character Building, Volume I (of 17)|Various
The commander-in-chief still kept him attached to the headquarter staff, and constantly employed him on special service.
Napoleon's Marshals|R. P. Dunn-Pattison
So far Murat had always held subordinate commands; his great ambition was to become the commander-in-chief of an independent army.
Napoleon's Marshals|R. P. Dunn-Pattison
Their jurisdictions overlapped and the Gascon would play second fiddle to no one save to his great brother-in-law.
Napoleon's Marshals|R. P. Dunn-Pattison
But the novel disappeared under the clothes with amazing celerity as the voice of her sister-in-law demanded admission.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills