deciduous bramble (Rubus idaeus or similar) with thorns and white flowers; its red, sweet-and-sour fruit, used for food and in traditional medicine

A serious injustice for which there is no way to seek redress, literally referring to the darkness inside an overturned basin where sunlight cannot reach.

A metaphor for a deep grievance or injustice that is impossible to right because the truth is hidden, much like light cannot shine under an overturned bowl