an extraordinary or exceptional experience
une expérience extraordinaire ou exceptionnelle (une experience extraordinaire ou exceptionnelle)
"The view from the space station was truly an out of this world experience."
"La vue depuis la station spatiale était vraiment une expérience hors de ce monde." (La vue depuis la station spatiale etait vraiment **une experience hors de ce monde**.)
to become involved with something or someone, often unwisely
to feel extremely good or happy
so stressed or tired that one can hardly cope
I do not know the answer to a question
too difficult to understand
to achieve great success or gain a lot of money