Split infinitive. Gram. A simple infinitive with to, having a modifier between the verb and the to; as in, to largely decrease. Called also cleft infinitive.
Note: The use of the split infinitive is commonly considered to be ungrammatical, but by most grammarians it is considered acceptible.
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split infinitive
n : an infinitive with an adverb between `to' and the verb
(e.g., `to boldly go')