godan verb (-ru), transitive verb
entreat; request earnestly
Archaic or highly formal verb for making a heartfelt request; modern Japanese would typically use お願いする or 懇願する.
昔の文書では「御助力を頼み入る」のように使われた。
In old documents, it was used like 'I earnestly request your assistance.'
Compound of 頼み (request) + 入る (enter), literally 'to enter a request'; the exact historical derivation is uncertain.