万一の事があっても
万一の場合には
if anything [the worst] should [does] happen
万一を頼む
provide [put something aside] against an emergency [a rainy day]
読み方 まんいち
One chance in ten thousand:(の事)a chance occurrence; a possible event; a possibility; a contingency; an emergency; an eventuality; an accident; chance:(=の) possible; contingent; accidental
(Should) by any chance; (may) possibly, be some possibility:(=にも) (can not) possibly by any possibility