To spontaneously release pressure or tension.
To burst forth; to break out.
To eject something violently (such as lava or water, as from a volcano or geyser).
(Of birds, insects, etc.) To suddenly appear in a certain region in large numbers.
To make (someone or something) sensitive or responsive to certain stimuli.
To render capable of being acted on by actinic rays of light.
To make (someone) increasingly aware of, in a concerned or sensitive way.