Expand ORS.

Explanation

**Step-by-Step Solution:**

1. **Identify the Acronym**: The first step is to recognize that ORS is an acronym. We need to find out what it stands for.

2. **Expand the Acronym**: ORS stands for "Oral Rehydration Solution". This is the full form of the acronym.

3. **Understand the Purpose**: Oral Rehydration Solution is a glucose-based salt solution. It is specifically designed to help individuals who are experiencing dehydration, particularly due to conditions like diarrhea.

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