[失之毫厘,谬以千里 / 失之毫厘,謬以千里, shī zhī háo lí, miù yǐ qiān lǐ, ㄕ ㄓ ㄏㄠˊ ㄌㄧˊ, ㄇㄧㄡˋ ㄧˇ ㄑㄧㄢ ㄌㄧˇ]a tiny lapse can lead to a huge mistake (成语 saw); a minor discrepancy leading to enormous losses[Add to Longdo]
[差之毫厘,谬以千里 / 差之毫釐,謬以千里, chā zhī háo lí, miù yǐ qiān lǐ, ㄔㄚ ㄓ ㄏㄠˊ ㄌㄧˊ, ㄇㄧㄡˋ ㄧˇ ㄑㄧㄢ ㄌㄧˇ]the slightest difference leads to a huge error (成语 saw); a miss is as good as a mile[Add to Longdo]