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Jyutping lei5 lei5 sip3 sip3
Pinyin lī lī shè shè

Definitions (Wiktionary)
  1. phrase, Zhangzhou-Hokkien, idiomatic
    surreptitious; furtive; sneaky
    (syn.) 包包㘝㘝, 掩掩揜揜, 偷偷摸摸