to cloud over; becloud; obscure

(of sound in a movie, television program, etc.) occurring within the context of the story and able to be heard by the characters

an environmental cue, as the length of daylight or the degree of temperature, that helps to regulate the cycles of an organism's biological clock

easily crumbled or reduced to powder; crumbly

naive, simplistic, and superficial

beaming with happiness, optimism, or anticipation

a bitter, sharply abusive denunciation, attack, or criticism

awareness, realization, or knowledge; notice; perception