broom, to sweep, clear away
埽 centers on using a broom to sweep and clear away dirt or debris. The meanings 'broom', 'to sweep', and 'clear away' all connect to this single action of cleaning by sweeping.
埽 combines 土 (earth, ground) with 帚 (broom), suggesting sweeping the ground with a broom. The exact historical development is uncertain, but the component relationship is straightforward.
The left side is earth 土, and the right side is a broom 帚. Picture a broom sweeping dirt off the ground: 埽 means to sweep and clear away.
For ソウ, imagine sweeping so thoroughly that you 'sow' cleanliness like seeds: sow -> ソウ, and the broom clears the earth.