Meaning

verb to cause someone to lose clear vision, especially from intense light

verb overcome as with astonishment or disbelief

adjective in a state of mental numbness especially as resulting from shock

originFrom Middle English, from Old Norse dasaðr (“weary”), dasask (“to become weary”), from Proto-Germanic *dasōjan-, from the adjective *daza-, possibly from a variant of Proto-Indo-European *dʰer- (“to hold, support”), related to Armenian դադարել (dadarel, “to settle, stop, end”).

Etymology from Wiktionary, CC BY-SA 3.0