/flæʃ ||; flæʃ/verb1 [I,T] to produce or make sth produce a sudden bright light for a short time （使）闪烁，发出闪光: The neon sign above the door flashed on and off all night. 门上方的霓虹灯招牌彻夜闪个不停。That lorry driver's flashing his lights at us (= in order to tell us sth). 那个卡车司机正向我们打灯。
2 [I] to move very fast 闪过: I saw something flash past the window. 我看到有东西打窗前掠过。Thoughts kept flashing through my mind and I couldn't sleep. 许多念头不断掠过脑际，使我夜不能寐。
3 [T] to show sth quickly 迅速展示: The detective flashed his card and went straight in. 那侦探把证件一亮，径往里边走去。
4 [T] to send sth by radio, television, etc （通过电台、电视等）发送: The news of the disaster was flashed across the world. 这次灾难的新闻发送到全球各地。
flash back (used about a person's thoughts) to return suddenly to a time in the past （指思想）突然回到以往，突然回想起:
Something he said made my mind flash back to my childhood. 他的话勾起了我对童年的回忆。