Green’s Dictionary of Slang

(Anglo-Ind.) to be quiet, also as excl.

1832		Captain Mundy Pen & Pencil Sketches I 110: The young jemadar, however, soon silenced them with a ‘Chup, teeree!’&c.
1839		P.M. Taylor Confessions of a Thug III 19: ‘Choop!’ said I, ‘silence! This is no time for our secrets’.
1849		W.H. Jeremie Furlough Reminiscences 196: Adjt. Silence, you suer! Did you not see him smoking? Bunghy. Truth, my lord – you are my – Adjt, Choop rascal. – Take him away, and the woman too.
1857		Bombay Qtly Rev. V 134: ‘Why don’t you maro the soors?’ observes the gentleman, with a gruff good-nature; ‘I’ll soon make them choop!’.
1866		G.O. Trevelyan ‘Dawk Bungalow’ in Fraser’s Mag. Mar. 385: ‘Bless me, Sir, if you have no better suggestion to make you had better choop’.
1879		R.A. Sterndale Afghan Knife II 9: ‘Lies! lies! they are Kafirs, they are Kafirs! hear what is written in the book!’ screamed the old fakir; but a thundering ‘chup!’ (silence) from the crowd again restrained him for a while.
1888		Kipling ‘The Likes O’ Us’ in Civil & Military Gaz. 4 Feb. (1909) 109: ‘An’ now choop, an’ lie still’.
1901		Kipling Kim 238: ‘Chûp!’ (be still) he cried, and again he heard a chuckle, that decided him. ‘Chûp — or I break your head’.
1919		K.D. Malaviya Open Rebellion in Punjab 33: Everytime that Somdatt opened his lips to utter a few words in his defence, one or the other officer visited him with a crushing ‘Chup ho ja’.