Noun
(nonstandard, rare) A wind instrument.
Obsolete spelling of slogan (“a battle cry among the ancient Irish or highlanders of Scotland”) [17th–19th c.]
Source: en.wiktionary.orgHarry Potter and the Half-Blood Prince In the sixth book, Dumbledore fetches Harry from Privet Drive and takes him to persuade Horace Slughorn to rejoin the Hogwarts staff. Source: Internet
The notes greatly bolster Harry's performance in Potions, so much so that he impresses Slughorn. Source: Internet