[冰冻三尺,非一日之寒 / 冰凍三尺,非一日之寒, bīng dòng sān chǐ, fēi yī rì zhī hán, ㄅㄧㄥ ㄉㄨㄥˋ ㄙㄢ ㄔˇ, ㄈㄟ ㄧ ㄖˋ ㄓ ㄏㄢˊ]three feet of ice does not form in a single day (成语 saw); Rome wasn't built in a day[Add to Longdo]
[さんじゃくさがってしのかげをふまず, sanjakusagatteshinokagewofumazu](exp) (See 三尺去って師の影を踏まず) a student must never forget to honor their teacher (honour)[Add to Longdo]