desgañitarse

A reflexive verb for shouting or screaming until your voice strains — se desgañitó pidiendo ayuda. It almost always describes real physical effort, not just speaking loudly.

• Me desgañité llamando al perro por todo el parque. — I shouted myself hoarse calling the dog all over the park.
• El vendedor se desgañitaba anunciando sus productos. — The vendor was shouting himself hoarse advertising his products.
• No hace falta que te desgañites, ya te oigo. — You don't need to scream your lungs out, I can already hear you.

It implies straining your voice to the point of hoarseness, not just speaking loudly — gritar covers ordinary loud speech; reach for desgañitarse only when the effort is extreme.

Often confused with gritar.