

A qualidade do serviço decaiu bastante nos últimos anos.
Depois dos setenta, a saúde dele começou a decair.
O interesse dos alunos não pode decair a meio do semestre.
"decair" is in the lesson "Verbs 7" (Level 19), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.