意識を取り戻す/回復する (regain consciousness)

The medical/clinical set phrase for regaining consciousness, surfacing as 意識を取り戻す (native 取り戻す, 'take back') or 意識を回復する (Sino-Japanese 回復, 'recover'). Register-equivalent: both common in news and medical contexts. The casual conversational alternative is 意識が戻る ('consciousness comes back,' intransitive). The verb 取り戻す applies more broadly to recovering abstract things — 信頼, 自信, 元気.