Espreitar means 'to peek', 'to spy', or 'to glimpse'. It's a less common verb than simply 'to see' (ver) and carries a sense of anticipation and a subtle, often cautious, observation.
In the song, the phrase "Quando o sol espreitar de novo" (When the sun peeks out again) beautifully personifies the sun, suggesting a hopeful, gentle return after a period of darkness or difficulty. It evokes a feeling of new beginnings and quiet optimism.
Ana Moura wrote ‘Quando O Sol Espreitar De Novo’ for her 2012 album Desfado, and it sits in the quiet after a breakup rather than in the fight itself. She circles one confession twice: ‘Não é nada’ [It's nothing], ‘Sou apenas eu não entendendo tudo’ [It's just me not understanding everything] — a refrain that admits the numbness is really just confusion wearing a calmer face. Between the two verses the scenery quietly changes, from ‘Encontro o chão deserto’ [I find the deserted ground] to ‘Encontro o céu aberto’ [I find the open sky], time doing what arguing never could. She ends on a plain hope instead of a resolution: ‘Ainda espero ver-te a meu lado, quando o sol espreitar de novo’ [I still hope to see you by my side, when the sun peeks out again] — waiting for an ordinary sunrise to undo what one night couldn't.