In one of my posts ("that's a very good one to know" vs. "that's good to know"), a kind contributor says
"That's a good one" is a stock phrase
I've seen this term (would I call it a term?) "stock phrase" a few times though, I still don't know what does it mean. So, I searched a bit and got this explanation
A phrase frequently or habitually used by a person or group, and thus associated with them.
When read this words, first phrase shows up in my mind is "Obama (Yes We Can)".
Similarly, "That's a good one" is associated with a specific group when it means some appreciation of jokes.
Is my understand right? Could someone please give a hint? Thanks in advance.