This is the 2362nd most frequent Catalan word.
matar
To kill.
Here, 'matar' is used metaphorically to describe occupying or passing free time by engaging in an activity.
Va decidir matar el seu oci estudiant una nova llengua.
He decided to kill his free time by studying a new language.
In this sentence, 'matar' is used in its primary sense of ending the life of a living being.
El lleó va matar la seva presa al capvespre.
The lion killed its prey at sunset.
Here, 'matar' is used figuratively to express an overwhelming feeling or annoyance caused by an action.