(Inf.) To be very thick.
"El pobre es un melón (de invierno)"
"Mira que eres melón, ¿eh?"
"Cállate ya, so melón"
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undeclared income
To put one's head on the block for someone. The idiomatic expression "Pongo la mano en el fuego y no me quemo" is used to state your blind trust in someone .




Alternatively, people use "pagar los platos rotos"