Learn Finnish: Taikina saattaa kohota yli reunan ja mennä hukkaan. - The dough might rise over the edge and go to waste.

This is a fixed idiom for a state change. The verb mennä (to go) is often used with an abstract noun in the illative case to describe a change in physical or abstract condition. Here, hukkaan is the illative of hukka (loss or waste), so it perfectly matches the pattern of entering a new state.

I have learned that hukka means 'wolf'. Is that related to mennä hukkaan?

Yes! In old Finnish agricultural society, if livestock or food was lost to the forest, it literally went to the wolf (hukkaan). Over time, the phrase broadened to mean going to waste or being completely lost, even when it is just dough escaping a bowl.

Why is it yli reunan instead of reunan yli?

The word yli (over) is flexible and can act as either a preposition (yli reunan) or a postposition (reunan yli). Both require the genitive case (reunan) and mean the exact same thing here. Prepositions are sometimes preferred when emphasizing the direction of a dynamic movement.

Why is mennä in its basic dictionary form here instead of being conjugated?