[{"Bold_text": "verb (used with object)", "List Items": ["to make intense more intense.Synonyms: concentrate , quicken , deepen Antonyms: weaken , alleviate", "to make more acute; strengthen or sharpen.Synonyms: concentrate , quicken , deepen", "Photography.to increase the density and contrast of (a negative) chemically."]}, {"Bold_text": "verb (used without object)", "List Items": ["to become intense or more intense."]}]