Thin value
A thin value bet is a bet with a hand that is only slightly ahead of the hands that call.
Second pair on the river after your opponent has checked twice is a typical thin value bet. A small size keeps the worse hands in.
Thin bets win a little often and lose a little sometimes. They are worth making against players who call too much and worth skipping against players who raise as a bluff.
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Practise decisions like this in the trainer: ten hands at a time, with the answer and the reason.