What does this sentence mean?
The sentence: “You can’t keep an old dog down”
Context: “On the way to the massage we stopped off at a little café. It was a bit rank, but there was nothing else around and we were hungry, as we’d been up since 4 a.m. Loads of plates were brought to the table. I tucked in. Then Emma the translator walked in and told me I’d been eating dog. If the camera had been rolling I’d have thought I had been set up, but it wasn’t, and everyone else looked at their plate to see if they had eaten it too. They hadn’t. Just me. Just my luck. It didn’t taste that good. I just thought it was cheap beef. Even food that I have at home tastes different here, so I didn’t really question what it was.
Oh, well. Isn’t there a saying that goes ‘You can’t keep an old dog down’? Guess I’ll find out in the next few hours. ”
From: Karl Pilkington. “An Idiot Abroad: The Travel Diaries of Karl Pilkington”
Thanks a lot:)