expergiscor.

Probably a middle (passive in form) from ex- (“ex-, out”) + per- (“intensive prefix”) + regō (“to rule, direct”) + -ēscō (“verbal suffix”). An alternative etymology derives the last two syllables from unattested *griscor, based on Proto-Indo-European *h₁ger- (“to awaken”), which dissimilated to *giscor after per-. In this case, cognate with Sanskrit जागृ (jāgṛ, “to awake”), Avestan 𐬟𐬭𐬀-𐬖𐬭𐬁𐬭𐬀𐬫𐬈𐬌𐬙𐬌 (fra-γrārayeⁱti), Ancient Greek ἐγείρω (egeírō, “to awaken”), Middle Persian wygrʼd (wiγrād) (whence Modern Persian بیدار (bidâr, “awake”)), Albanian ngrē (“to lift, to wake”). It is not known how the transitive sense for English "wake up" got no direct counterpart, putting expergiscor in a similar situation to Spanish gustar.