'कहावत' शब्द में प्रयुक्त प्रत्यय है:

In the word 'कहावत' (Kahawat), the root verb is 'कह' (Kah - to say). The suffix added to it is आवत (Awat).
$$\text{कह}+\text{आवत}=\text{कहावत}$$

This is a Krit Pratyay (कृत् प्रत्यय).