to suddenly have a clever idea
внезапно придумать умную идею (vnezapno pridumat umnuyu ideyu)
"I had a brainwave and solved the puzzle."
"Мне внезапно пришла умная мысль, и я решил головоломку." (mnye vnezapno prishla umnaya mysl i ya reshil golovolomku)
a small indication of what the future might be like
to work at a second job, especially secretly or part-time
feeling slightly unwell or upset
an emotionless or mechanical reaction
to be completely absorbed in what you’re doing
to be successful in life or career