molehill (n.)youdaoicibaDictYouDict[molehill 词源字典]
also mole-hill, mid-15c., from mole (n.2) + hill (n.).
To much amplifying thinges yt. be but small, makyng mountaines of Molehils. [John Foxe, "Acts and Monuments," 1570]
[molehill etymology, molehill origin, 英语词源]