平时不烧香，临时抱佛脚
píng shí bù shāo xiāng , lín shí bào fó jiǎo
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1 lit. to clasp the Buddha's feet when danger arises (idiom); fig. to profess devotion only when in trouble
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2 doing things at the last minute
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3 to make a hasty last-minute effort (often refers to cramming for exams)