empurrar.

Inherited from Old Galician-Portuguese *enpurrar (attested as the hapax derived term enpurron); further etymology is uncertain. Cognate with Galician empurrar and, according to Joan Coromines, Asturian emburriar. Coromines claims the word is unrelated to empuxar and ultimately connects it to Latin porrigere. Most modern dictionaries claim the word was borrowed from Spanish empujar (“to push”), which would make it a doublet of the inherited empuxar as well as the Latin borrowing impulsar. However, this etymology is unlikely, seeing as the word is attested at a time when Spanish ⟨j⟩ was still pronounced as /ʃ/, and Portuguese ⟨rr⟩ as /r/. The pronunciations of these words in their respective languages only became more similar in later centuries. For more information, see also empurrão and the Galician entry above.