かくなる上うえは

expression

now that it's come to this; since things have reached this point

A formal, somewhat literary expression used to introduce a decisive action or resolution after a situation has developed to a critical stage. Often followed by a statement of determination or an unavoidable consequence.

• かくなる上うえは、最さい後ごまで戦たたかうしかない。

  Now that it's come to this, we have no choice but to fight to the end.

• かくなる上うえは、正しょう直じきに話はなすべきだ。

  Since things have reached this point, you should speak honestly.