All-over strength is the ability to do anything without training specifically for that thing. This is a good example:
I never train this movement, but I do train in a way that will effectively give me the most strength in relation to my time investment. My training allows me to anything. To be able to snatch 90% of my bodyweight with one hand, to do handstand pushups, jump high, run fast, last 5 5-minute rounds in a fight. Goals are overrated, but strong enough for anything.