directly (adv.)youdaoicibaDictYouDict[directly 词源字典]
1510s, "in a straight line," from direct (adj.) + -ly (2). Figurative use is slightly earlier (c. 1500). Meaning "at once, immediately in time" (c. 1600) is from earlier sense of "without intermediate steps" (1520s).[directly etymology, directly origin, 英语词源]