Expand IUCD.

Explanation

**Step-by-Step Solution:**

1. **Identify the Acronym**: The question asks to expand the acronym IUCD.
2. **Recall the Context**: IUCD is related to reproductive health and is a method of birth control.
3. **Provide the Full Form**: The full form of IUCD is "Intrauterine Contraceptive Device".
4. **Explain the Function**: IUCDs are devices placed in the uterus to prevent pregnancy. They work by various mechanisms, such as preventing the implantation of an embryo, suppressing sperm motility, and promoting sperm phagocytosis.

**Final Answer**: The full form of IUCD is Intrauterine Contraceptive Device.
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