to secretly hear someone’s conversation
слушать разговор кого-то тайно (slushat' razgovor kogo-to tayno)
"He was caught listening in on their private discussion."
"его поймали, когда он подслушивал их частную беседу." (ego poymali, kogda on **listening in on** ikh chastnyy razgovor)
to encourage someone to continue with confidence or hope
to illuminate or brighten with lights or joy
to make someone feel excited or motivated
to show support or enthusiasm for someone or something
to understand new concepts or ideas fast
to write something so it can be used later for a purpose