echoyoudaoicibaDictYouDict[echo 词源字典]
echo: [14] Echo comes via Old French or Latin from Greek ēkhó, a word related to ēkhé ‘sound’. It may have originated as a personification of the concept ‘sound’, which developed eventually into the mythological mountain nymph Echo, who faded away for love of Narcissus until nothing but her voice was left. (The Greek verb derived from ēkhé, ēkhein, is the ultimate source of English catechism.)
=> catechism[echo etymology, echo origin, 英语词源]
echo (n.)youdaoicibaDictYouDict
mid-14c., "sound repeated by reflection," from Latin echo, from Greek echo, personified in classical mythology as a mountain nymph who pined away for love of Narcissus until nothing was left of her but her voice, from or related to ekhe "sound," ekhein "to resound," from PIE *wagh-io-, extended form of root *(s)wagh- "to resound" (cognates: Sanskrit vagnuh "sound," Latin vagire "to cry," Old English swogan "to resound"). Related: Echoes. Echo chamber attested from 1937.
echo (v.)youdaoicibaDictYouDict
1550s (intrans.), c. 1600 (trans.), from echo (n.). Related: Echoed; echoing.