[一刀两断 / 一刀兩斷, yī dāo liǎng duànㄧ ㄉㄠ ㄌㄧㄤˇ ㄉㄨㄢˋ] lit. one knife to cut two segments (成语 saw); to make a clean break; firm resolution to break off a relation#59498
[キセルじょうしゃ, kiseru jousha] (n, vs) (See 煙管乗り) cheating on train fare by buying tickets covering only the first and last portions of the journey (so-called because traditional pipes had metal only in two short segments at the ends)
[ししょくていり;よんしょくていり, shishokuteiri ; yonshokuteiri] (n) four-color theorem (colour) (theorem stating that any map can be colored such that no two adjacent segments have the same color, if only four colors are used)