chirping of birds
喿 centers on the sound of birds chirping together, evoking a noisy, chattering chorus.
喿 combines 品 (many mouths) and 木 (tree), suggesting the collective chirping of birds in a tree. The exact historical development is uncertain, but the component arrangement visually supports the meaning.
Three mouths 品 in a tree 木: imagine a flock of birds perched in the branches, all chirping at once.
For ソウ, picture the sound of birds chirping as a soft 'sow' (ソウ) echoing through the tree: sow -> ソウ.