The word 有空 is formed through a direct conceptual combination of its two components: 有 (yǒu), meaning "to have" or "there is", and 空 (kōng), meaning "emptiness", "space", or "free time". It constructs its meaning not grammatically but by painting a simple, vivid mental picture: one "has emptiness". This leverages the concrete concept of physical space or a blank schedule to metaphorically express the abstract state of being unoccupied or available, effectively equating temporal or mental availability with the possession of open, unfilled space.