verb1 + 也 + verb1 + 不 + verb2
What effect does it have when a verb is repeated twice with a 也 character in-between, followed by 不 and some other verb, as in 說也說不出 or in 擋也擋不住?

It looks to be a pattern.

Question

verb1 + 也 + verb1 + 不 + verb2
What effect does it have when a verb is repeated twice with a 也 character in-between, followed by 不 and some other verb, as in 說也說不出 or in 擋也擋不住?

It looks to be a pattern.

Answer

это не три глагола... это один глагол с негативной формой себя же...потому что 說出 это одно слово и 擋住  тоже одно слово а ...也...不 используется для экспрессии

Answer

Good summary!

Answer

this pattern is used to escalate the degree of uncontroled situation.to express kind of helpless feeling.

（没有你）我吃也吃不下，睡也睡不香   i can neither eat nor sleep (without you).

Answer

說也說不出 =根本說不出

擋也擋不住=根本擋不住

打也打不死=根本打不死

吃也吃不饱=根本吃不饱

But V+也+V seems to be more emotional