Green’s Dictionary of Slang

1. (also nose-ender) a blow on the nose [nose v. (3b)].

1825		Pierce Egan’s Life in London 5 June 149/1: Savage [...] tipt the Cab a noser, which produced the claret.
1854		‘Cuthbert Bede’ Adventures of Mr Verdant Green (1982) II 159: I couldn’t go to business properly, or give a straight nosender, nohow.
1864, 1867, 1870		Hotten Sl. Dict.
1876		C. Hindley Life and Adventures of a Cheap Jack 190: Giving the man such a nose-ender that sent him all abroad.
1891		Sporting Times 14 Mar. 2/2: [They] met a nasty chopping sea, with a nose-ender in the way of wind.

2. a bloody nose [nose v. (3b)].

1859, 1860		Hotten Dict. of Modern Sl. etc.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 12/2: The winner is the man who gives the first ‘noser;’ a bloody nose however is required to show that the blow was a veritable noser.
1876		C. Hindley Life and Adventures of a Cheap Jack 258: It was a ‘noser,’ and no mistake about it, and the ‘ruby’ spurted in all directions.

3. (US Und.) an informer [nose n. (1)].

1862		Cornhill Mag. ii 336: There are a few men and women among thieves called nosers. They are so called because they are in the secret pay of the police, giving information when the information will not lead to the crimination of themselves [F&H].
1900		Sporting Times 12 May 2/2: From Noser, the Rozzer.
1992		Bentley & Corbett Prison Sl. 36: Noser A prison informant.

4. (US) an interfering person.

1911

Hayti Herald (MO) 27 July 2/3: All the world detests the ‘noser’ - the quiz, the meddlesome, prying person.