puckishyoudaoicibaDictYouDict[puckish 词源字典]
puckish: [19] In English folklore from the late Middle Ages onward, Puck was a mischievous but essentially harmless sprite, up to all sorts of tricks (hence the coining of puckish for ‘mischievous’). But his Anglo-Saxon ancestor Pūca was a far less pleasant proposition – for this was the Devil himself. He gradually dwindled over the centuries, but a hint of his former power remained in his placatory alternative name Robin Goodfellow. It is not known whether pūca is of Germanic or Celtic origin.
[puckish etymology, puckish origin, 英语词源]
recession (n.)youdaoicibaDictYouDict
1640s, "act of receding, a going back," from French récession "a going backward, a withdrawing," and directly from Latin recessionem (nominative recessio) "a going back," noun of action from past participle stem of recedere (see recede).

Sense of "temporary decline in economic activity," 1929, noun of action from recess (q.v.):
The material prosperity of the United States is too firmly based, in our opinion, for a revival in industrial activity -- even if we have to face an immediate recession of some magnitude -- to be long delayed. ["Economist," Nov. 2, 1929]
Ayto notes, "There was more than a hint of euphemism in the coining of this term."