Ever had iced coffee that sat out for too long? That sad, watery state is pagkalasaw. It's the melting of ice in your drink, making it "matabang" (bland). It's when the "sarsa" (sauce) is too thin. Figuratively, it can even describe a feeling or an idea that has lost its potency or intensity. "Yung galit ko, nag-pagkalasaw na rin sa tagal ng paghihintay."