koru
1.

To become deeply engrossed in a particular hobby or interest, often to an obsessive degree, leading to a heightened emotional involvement in that pursuit.

2.

To meticulously refine and enhance the details of something, demonstrating an emphasis on craftsmanship and a dedication to quality.

3.

To experience a sensation in the muscles where tension and contraction cause them to become rigid or sore, often resulting in discomfort.

4.

To cluster together or become solidified, typically referring to substances that have thickened or frozen due to cooling.

Example:

最近はどんな物に凝っているの?

こごkogoru
1.

To become deeply absorbed or infatuated with a particular hobby or interest, often to an extent that it influences one's daily life or activities.

2.

To put meticulous effort into the details or finishing touches of an artistic or design project, emphasizing a high level of craftsmanship.

3.

To experience muscle stiffness or tension, typically as a result of overuse or fatigue, leading to an uncomfortable, tight sensation in the affected area.

4.

To solidify or change from a liquid state into a firmer form, often as a result of cooling, similar to how certain liquids set into jellies or gels.

しこshikoru
1.

To become deeply engrossed or absorbed in a particular hobby or interest, to the point of obsession or singular focus.

2.

To refine or enhance details meticulously, often in the context of design or craftsmanship, showcasing a commitment to aesthetics and quality.

3.

To develop stiffness or tension in muscles, often as a result of overuse or poor circulation.

4.

To transition from a liquid state to a solid or gel-like consistency due to cooling or solidification processes.