Good to go

Also, why are coffee shop assistants called baristas? They press a couple of knobs, bang the tin cup thing very loudly, and fill the thing up with coffee. I want a job with a fancy title

I'm browsing the OED and the verb "to go" in the sense of pregnancy is interesting.

In the 19C someone might have said:

I go with child or/
The woman goes nine months and then brings forth a child.

Nowadays we still say: She's three months gone.

Also, I like how "go" used to be use to describe coins or banknotes which could be accepted as currency (or not):

This half crown will never go. It's brass.

Nowadays, if we were using "go" in this way I suppose we would say:

I have an old paper five pound note which will not go.

I don't think I'd ever say that a bank note wouldn't "go", but I would use it of machines and gadgets even stationary ones that don't go anywhere:
I've changed the battery but this torch still doesn't go.
The oven's OK but the grill won't go.