Green’s Dictionary of Slang

hop n.4

[hop v.1 ]

In phrases

on the hop

1. [late 19C+] running away, escaping, on the run; thus fig. unawares.

2. busy, active.

3. [1990s+] (Irish) truanting.

play the hop (v.) (also go on the hop) [hop the wag under hop v.1 ]

1. to run around from place to place.

2. [1930s–60s] to play truant from school.

take it on the hop (v.) (also take it on the arches)

[1960s+] (US) to run away; to escape.