In society. The upper crust of society. An angler’s phrase. A lot of fishgathered together is called a swim, and when an angler can pitch his hook in such a place he is said to be “in a good swim.” To know persons in the swim is to know societyfolk, who always congregate together.
“Cottontree, who knows nearly everybody in the swim of European society … informs him thatLucy Annerley is the daughter of Sir Jonas Stevens.”—A. C. Gunter: Mr. Potter of Texas, book iii. chap. xiv.