What does más o menos mean?
Expression
more or less — or: sort of
With numbers it means approximately: unos veinte, más o menos. Answering whether you know how to do something it means something rather different: not very well. It is one of the most useful answers in Spanish because it commits you to nothing, and also one of the most alarming to whoever is listening.
—¿Sabes conducir? —Más o menos.
