1. To gradually reduce something in size, amount, or number through repeated small actions or decisions
The committee whittled down the budget from $10 million to $5 million.
O comitê reduziu gradualmente o orçamento de 10 milhões para 5 milhões de dólares.
2. To carve wood into a smaller shape by cutting away small pieces
He whittled down the wooden stick into a pointed shape.
Ele reduziu o bastão de madeira a uma forma pontuda.