This is the 2099th most frequent Catalan word.
rubio
The Catalan word "rubio" does not exist; it may be a misspelling or a Spanish word meaning "blonde." In Catalan, "blonde" is "ros."
Here, 'rubio' refers to a person with blond hair.
En Joan és un rubio i sempre li agrada parlar.
Joan is a blond man and he always likes to talk.
In this context, 'rubio' describes the color of the thread.
He comprat un fil de costura rubio per arreglar la camisa.
I bought a blond sewing thread to mend the shirt.
Here, 'rubio' indicates the light coloration of the coffee.