mushroom cloud
(transitive, idiomatic) To propose an idea or make a suggestion in order to learn the reaction of others to it.
To act in a polite or proper way.
Free from peril.
A large cloud of smoke, flame and debris that rises into the sky as a result of a large explosion, especially after a nuclear explosion, characterized by a long shaft rising from the ground into a much-larger or more-spread-out top, reminiscent of a mushroom in shape.
丘から、私たちは遠くの谷の上にそびえ立つ巨大なキノコ雲が上がるのを茫然と見つめていた。
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