This is the 736th most frequent Portuguese word.
deixa
"Deixa" means "leave," "allow," or "let" depending on context.
Here, 'deixa' is used in the sense of leaving something in a specific place or condition.
Ela sempre deixa as chaves na mesa.
She always leaves the keys on the table.
In this sentence, 'deixa' is used as part of the expression 'não deixa de ser,' meaning not to stop being or to still be.
Não deixa de ser uma boa ideia.
It is still a good idea.
Here, 'deixa' is used to express allowing someone to do something, particularly in an imperative form.