せねば

expression

must do; have to do; ought to do

Literary or formal expression equivalent to しなければならない. Often used in the set phrase せねばならない. Not used in casual speech.

See also: せねばならない

• 約やく束そくは守まもらせねばならない。

  One must keep one's promises.

• この問もん題だいは早そう急きゅうに解かい決けつせねばならない。

  This problem must be solved immediately.