万まん々まん一いち

adverb

by some very rare chance; in the very unlikely event that

Emphatic form of 万一; used to stress that the possibility is extremely remote. Often appears in conditional clauses with ～たら, ～ば, or ～ても.

See also: 万一

• 万まん々まん一いちのことがあったら、すぐに連れん絡らくしてください。

  If by some very rare chance something happens, please contact me immediately.

• 万まん々まん一いち彼かれが来きても、私わたしは会あわないつもりだ。

  Even in the very unlikely event that he comes, I don't intend to see him.