To confine means to keep someone or something within limits or boundaries, preventing free movement. When a principal confines a disruptive student to the office, the student can't leave that space. When a zookeeper confines an animal to its enclosure, the animal stays within those walls or fences.

The word often suggests restriction that feels limiting or uncomfortable. A doctor might confine a patient with a contagious illness to their hospital room to protect others. During a blizzard, families might find themselves confined to their homes, unable to venture outside safely. A shy student might feel confined by nervousness, unable to speak up in class even when wanting to.

Confines (the noun form) refers to the boundaries or limits themselves. Within the confines of a soccer field, players follow certain rules. Beyond the confines of the school building, different rules apply. A creative writer working within the confines of a strict assignment might struggle to express their ideas freely.

The word carries a sense of being held in or held back. While sometimes confinement serves an important purpose (like keeping dangerous animals safely contained), it usually suggests something unfortunate about being restricted when you'd rather move freely. A student confined to the classroom for recess knows this feeling well.