gros

In a sentence

• El gos gros descansava sota l'arbre.

  The big dog was resting under the tree.

  In this sentence, 'gros' is used as an adjective to describe the size of the dog, signifying that the dog is large.

• Vaig veure un peix gros al llac.

  I saw a big fish in the lake.

  Here, 'gros' again describes size, indicating that the fish observed was considerably large in size.

• Aquest problema és gros, cal una solució ràpida.

  This problem is serious, a quick solution is needed.

  In this usage, 'gros' is applied metaphorically to convey the importance or seriousness of the problem, rather than physical size.