1. Methods or procedures kept hidden or confidential, known only to a select few
The chef guards his secret techniques for making the perfect sauce.
O chef guarda suas técnicas secretas para fazer o molho perfeito.
2. Specialized or advanced methods in martial arts, sports, or crafts that are not widely known
The master revealed his secret techniques to only his most dedicated students.
O mestre revelou suas técnicas secretas apenas para seus alunos mais dedicados.