also second-best
1.
Second best is used to describe something that is not as good as the best thing of its kind but is better than all the other things of that kind.
He put on his ~ suit...
ADJ: usu ADJ n
2.
You can use ~ to describe something that you have to accept even though you would have preferred something else.
He refused to settle for anything that was ~.
ADJ
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Second best is also a noun.
Oatmeal is a good ~.
N-SING