bottle

The primary image is one of containment and restriction. As a physical object, it implies a portable, sealed vessel designed to keep liquids secure. When used as a verb for emotions, the nuance shifts to an oppressive internal pressure. It suggests a deliberate act of sealing away feelings, creating a tension that feels like it might eventually 'burst' or explode, similar to a pressurized carbonated drink. In British slang, "bottle" also carries a connotation of courage (e.g., "to lose one's bottle"), though the core sense remains tied to the idea of containing one's nerves.