Refers specifically to the sudden loud sound during storms, often after lightning. The children slept soundly, undisturbed by the occasional thunderclaps.
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Expresses Power
Evokes images of power and force, can imply something overwhelming. The quarterback's tackle was like a thunderclap, stopping the play in its tracks.
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Literal Use
Used literally in discussions about weather or vividly describing scenes in literature. When the thunderclap struck, the old house seemed to shake at its foundations.