As a whole; all together; en masse. An adverbial expression often used to indicate collective or overall action.
国民挙げてオリンピックを応援した。
The whole nation cheered for the Olympics.
会社は挙げて新製品のキャンペーンに取り組んだ。
The company as a whole worked on the new product campaign.
彼らは挙げて反対の意思を示した。
They collectively showed their opposition.