English-Finnish translations for chum up

To be friendly toward someone, especially in an ingratiating way; to form a friendship (''with''
To initiate through a ritual involving beating him with sticks and swords, accompanied by music, to extort money from him.John Camden Hotten, ''A Dictionary of Modern Slang, Cant, and Vulgar Words'', London, 1859, p. 21.^{[https://catalog.hathitrust.org/Record/011564672]}

Dictionary