What is the verb form of "Enjambment"?

I wish to say in a poetry commentary something like:

These two enjambing lines demonstrate...

I know enjambing is not a real word, but I wish for something to substitute.

There is no direct verb form, I think you could use some alternative expressions like link or overlap depending on the context. In the sentence you suggest you need an adjective rather than a verb:

Enjambment:

• also enjambement, 1837, from French enjambement or from enjamb (c. 1600), from French enjamber "to stride over," from en- (see en- (1)) + jambe "leg" (see jamb).

Enjambment

• derived from a French word enjambment, means to step over or put legs across. In poetry it means moving over from one line to another without a terminating punctuation mark. It can be defined as a thought or sense, phrase or clause in a line of poetry that does not come to an end at the line break but moves over to the next line. In simple words, it is the running on of a sense from one couplet or line to the next without a major pause or syntactical break.

(literarydevices.net)

Try straddle. Like "the phrase straddles two lines." Enjambment comes from the french word for straddling.