B2 [ I or T ] to shine brightly and suddenly, or to make something shine in this way（使）闪耀，（使）闪光

[ I ] literary If someone's eyes flash, they look bright because of the anger or excitement the person is feeling.（眼睛因愤怒或激动而）发亮，闪耀

C2 [ I usually + adv/prep ] to move very fast飞驰，掠过

C2 [ T ] to show something for a short time（快速）出示，显示

[ I or T ] informal If a man flashes, he shows his sexual organs in public.露阴，当众暴露性器官

[ T usually + adv/prep ] to communicate something quickly, especially using radio or light waves（尤指用无线电或光波）通信，联络

[ I + adv/prep ] If something flashes through/across your mind, you suddenly or quickly think of it.（想法等）突然闪现

B2 [ C ] a sudden bright light that quickly disappears闪光；闪耀

CB [ C usually singular ] a sudden, powerful emotional or mental experience（情感的）突发；（想法的）突现

B2 [ C or U ] the device or system used to produce a bright light for a short time when taking a photograph闪光灯；闪光操纵装置

[ C ] UK a small object or piece of material worn on a military uniform as a sign of rank, or (on clothing) a strip or mark of colour different from the main colour（佩于军服上的）徽章，肩章，臂章；（衣服上的）色条，色块

[ C ] humorous a quick look at something飞快的一瞥

looking expensive in a way that attracts attention昂贵的；奢华的