"'Those who say it can not be done, should not interrupt those doing it.' -Chinese Proverb," Ivanka posted on Monday, the night before her father and Kim came together to seek an end to a tense decades-old nuclear stand-off.
China's internet quickly lit up puzzled rather than flattered by the reference.
"Our editor really can't think of exactly which proverb this is. Please help!" the news channel for Sina -- the company behind Weibo, China's largest Twitter-like platform -- wrote on its official social media account.
In thousands of comments on Weibo, users proffered scores of different suggestions without arriving at a consensus.
Some suggested the proverb "the foolish old man removed mountains" -- a common phrase used to signify perseverance. It refers to a fable about a man who persisted in his attempt to level a mountain he found inconvenient by dogged digging.
Ivanka Trump's family has a lot of fans in China. Her six-year-old daughter, Arabella Kushner, became an online sensation by singing ballads in Mandarin and reciting Chinese poetry in a video that was shown to President Xi Jinping during Donald Trump's visit to Beijing last year.
But her mysterious proverb was panned on Weibo.
Another said: "It makes sense, but I still don't know which proverb it is."
"One proverb from Ivanka has exhausted the brain cells of all Chinese internet users," a commenter admitted.
Bill Kristol, editor of the US political magazine the Weekly Standard, tweeted a guess that the phrase "seems in fact to be American from the turn of the 20th c.- which makes sense, since its spirit is can-do Americanism".
"But why are Trump WH (White House) aides giving our proverbs to China, increasing our proverb deficit?" he quipped.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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