Construction to suddenly crumble for example? (5,10)
I believe the answer is:
split infinitive
I believe this is a double definition.
'construction' is the first definition.
(grammatical construction)
'to suddenly crumble for example?' is the second definition.
('to suddenly crumble' is a split infinitive)
(Other definitions for split infinitive that I've seen before include "To boldly go" , "Grammatical error to many" , "structure some object to" .)