costal groove (noun)

1. As he gently caressed her, his fingers traced the delicate curve of her costal groove.

2. In the futuristic world of cyborgs and androids, scientists developed a high-tech suit that could repair damaged costal grooves instantly.

3. During the Battle of Thermopylae, the soldiers fought valiantly as arrows pierced their armor, aiming for the vulnerable costal grooves.

4. According to Greek mythology, Prometheus created humans by molding clay and shaping it around the costal grooves to give them their unique form.