一斉
adverb
all at once
平等で一様なこと。また、そのようなさま。
all at once
いっせい
B2Upper-Intermediate
合図とともに、参加者が一斉に走り出した。
At the signal, all the participants started running at once.
春になると、野に小さな花が一斉に咲く。
In spring, small flowers bloom all at once in the fields.
電車のドアが開くと、大勢の人が一斉に乗り込んだ。
As soon as the train doors opened, a large number of people boarded at once.
信号が青になると、止まっていた車が一斉に動き出した。
When the light turned green, the cars that had been stopped all started moving at once.
暗い部屋から突然悲鳴が聞こえ、みんな一斉に振り返った。
A scream suddenly came from the dark room, and everyone turned around at once.
各社は選挙結果を一斉に報じた。
News organizations all reported the election results at once.
夕方になると、鳥の群れが一斉に空を横切った。
In the evening, a flock of birds flew across the sky all at once.
春になると、駅前の桜並木が一斉に咲く。
In spring, the row of cherry trees in front of the station all bloom at once.