cheese it

[…] he holds earnest parley with some members of the upper gallery who are beguiling the time by pelting us with nut-shells, and broken pipes. Two or three 'hallos!' and 'now thens!' accompanied by a strong recommendation to 'cheese it' (i. e., act of cessation), cause these trifling annoyances to cease.

1859, George Augustus Henry Sala, “Strollers at Dumbledowndeary”, in Gaslight and Daylight, page 328

The defence of Mr. Conover was so prompt and admirable that the conflict was protracted until the onlookers unselfishly gave the warning cry of "Cheese it—the cop!" The principals escaped easily by running through the nearest open doors into the communicating backyards at the rear of the houses.

1908, O. Henry, The Voice of the City, page 154

Knowing that Bobbie would be on sentry-go made all the difference. Any gangster will tell you that the strain and anxiety of busting a safe are greatly diminished if you've a look-out man ready at any moment to say “Cheese it, the cops!”

1960, P. G. Wodehouse, Jeeves in the Offing, chapter VIII