to stare at
偢 centers on staring intently, often with a sense of fixed attention or looking at something with concentration.
偢 combines 亻 (person) with 秋 (autumn), but the exact historical origin is uncertain. It may be a phono-semantic compound where 秋 contributes the sound and the person radical relates to human action or state, but this is speculative.
A person 亻 staring at autumn 秋 leaves, fixed in concentration as they watch the colors change.
For ショウ, imagine a person staring so intently that they are like a show: the show of autumn leaves captures their gaze. Show -> ショウ.