no obj.(perk up)
1- become more cheerful, lively, or interesting振作起来; 活跃起来：
in the second half the dance perked up
下半场时, 舞会活跃了起来
she'd been depressed, but she seemed to perk up last week.
她之前情绪低落, 但是上个星期精神好像好了起来。
1.1
- with obj.
perk someone/thing up
make someone or something more cheerful, lively, or interesting使振作; 使活跃： the coffee had perked him up long enough to tackle the reviews.
咖啡使他振奋了一段时间来处理那些评论。
- dialect perky; pert〈方〉活跃的, 活泼的, 生气勃勃的。
词源
late Middle English （in the senses 'perch' and 'be lively'）： perhaps from an Old French dialect variant of percher 'to perch'.
(一般作 perks)
1- informal money, goods, or another benefit to which one is entitled as an employee or as a shareholder of a company〈非正式〉额外收入, 外快, 额外好处：
many agencies are helping to keep personnel at their jobs by providing perks.
许多机构靠提供额外好处来留住员工。
1.1
- an advantage or benefit following from a job or situation特殊待遇, 特权：
they were busy discovering the perks of town life.
他们忙于发掘城镇生活的优越性。
词源
early 19th cent.: abbreviation of PERQUISITE.