what do these mean?
1. 'Your guess is as good as mine.'Since I have heard 1 in response to a question by someone, my guess is that it means basically that 'I don't know'. In other words, your guess would be as good as mine (if I were to guess). Is this correct?
2. 'He is as good as the next guy.'
3. 'He is as good as anyone.'
4. 'He is as good as they come.'
With #2, I'd say it's said to contradict the assertion that he (whoever he is) isn't very good. He may not be the best, but he's not bad: he's as good as the next guy.
A: How much do you think that muscle car is?
B: Hmmm... 1 mn dollars?
A: Interesting... I was about to say that the car costs 1.2 mn dollars.
B: Well... your guess is as good as mine, the seller says it costs 1.15 mn dollars.