Fluffy, on 2011-May-10, 09:07, said:
The term "overcall" includes balancing actions too. You can distinguish the two using "direct overcall" and ""balancing overcall" (or "protective overcall" in English English).
Logically they'd be called "overcall" and "undercall" respectively, but English isn't logical, and bridge teminology is especially illogical.