Right side
童 supplies the sound (tóng to zhuàng, an old t-/tr- alternation).
童 itself depicts a young servant or child with a tattoo brand on the forehead - bonded labour. Same phonetic appears in
钟 bell,
种 to plant,
撞 to bump. The bell-association is faintly relevant: a bell is something repeatedly struck, fitting
撞's collision sense.