The word 'toolbox' is a transparent compound formed from two native English words of Germanic origin. 'Tool' originates from Old English 'tōl', which referred broadly to an instrument or implement used for a task. 'Box' comes from Old English 'box', denoting a container, a meaning it has retained. The compound literally means "a box for tools," a straightforward descriptive term for a physical object. Its modern metaphorical extension, referring to a collection of skills or software utilities, logically follows the original concept of a container holding useful implements for a specific job.

Structure: tool + box - tool: From Old English 'tōl' (instrument, implement). Functional role: The core semantic element, denoting the objects contained. - box: From Old English 'box' (a container, originally made of boxwood). Functional role: A noun-forming element indicating a container or receptacle.