a sudden clever idea or solution
एक अचानक चतुर विचार या समाधान (ek achanak chatur vichar ya samadhan)
"I had a brainwave and realized how to fix the issue."
"मेरे पास एक ब्रेनवेव आया और मुझे समझ में आ गया कि समस्या को कैसे हल किया जाए।" (mere paas **ek brainwave** aaya aur mujhe samajh mein aa gaya ki samasya ko kaise hal kiya jaaye)
a secret enemy
to be full of great joy or excitement
to generate many creative ideas in a group discussion
to show others how to do something by demonstrating it yours...
to fail completely
to make a wrong assumption