Wiktionary
bosom friend
n. 1 A very close friend. 2 (context slang euphemistic English) A body louse.
Wikipedia
Bosom Friend
Bosom Friend is a Chinese language bimonthly celebrity and women's magazine published in Wuhan, China. The magazine is among the leading titles in the country.
Usage examples of "bosom friend".
Jack Maldon as a modern Sindbad, and pictured him the bosom friend of all the Rajahs in the East, sitting under canopies, smoking curly golden pipes - a mile long, if they could be straightened out.