平时不烧香，临时抱佛脚
ping2 shi2 bu4 shao1 xiang1 , lin2 shi2 bao4 fo2 jiao3
平時不燒香，臨時抱佛腳
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lit. to clasp the Buddha's feet when danger arises (idiom); fig. to profess devotion only when in trouble/doing things at the last minute/to make a hasty last-minute effort (often refers to cramming for exams)