Green’s Dictionary of Slang

hop n.1

1. [18C+] (also hopser) a dance.

2. [19C] a dancing academy.

3. [1900s] (US) an organized dance, held in a dancehall and frequented by lower class young people.

In compounds

hop merchant (n.) [merchant n.]

1. [late 17C–mid-19C] a dancing master.

2. [19C] a fiddler.

In phrases

house hop (n.)

[20C+] (orig. US black) a party at which the guests buy their refreshments to help pay the rent.

SE in slang uses

In phrases

from the hop

[1960s] (N.Z.) from the start.