Fetching details from the dictionary...

doing (with resolve); carrying out (e.g. a plan)
雨でも予定通り明日決行します。
We're going ahead with the plan tomorrow as scheduled, rain or shine.
計画を決行するかどうか迷った。
I wasn't sure whether to go ahead with the plan.
明日の決行は昨日の会議で確定しました。
Tomorrow's execution has been confirmed.