desabafar

From des- +‎ abafar (“suffocate”).

desabafar (first-person singular present indicative desabafo, past participle desabafado)

1. to unburden
2. to air
3. (by extension) to vent one's spleen, let off steam, rant

   Escrevo para desabafar, quando não tem ninguém para me ouvir.

   I write to vent when there is no one to listen to me.

• (air): arejar
• (vent): desafogar, expressar, exteriorizar