remedial measure; corrective action; countermeasure
A measure taken to deal with a problem or its aftermath; often used in formal or news contexts.
The government is hurrying to take remedial measures for the accident.
In response to the scandal, the company announced corrective measures.
措置 is a formal term for a measure or step taken, often administrative; 善後策 emphasizes the remedial nature of the action.
Compound of 善後 (ぜんご, 'aftermath; dealing with the aftermath') and 策 (さく, 'plan; measure').