when the situation becomes very difficult or challenging
状況が非常に難しくなるとき (jōkyō ga hijō ni muzukashiku naru toki)
"When the going gets tough, the tough get going."
"状況が困難になるとき、強い者は前に進む。" (**jōkyō ga kon'nan ni naru toki**, tsuyoi mono wa mae ni susumu)
to become happier or more cheerful
to have great influence or power over others
to suddenly make a lot of money
A very complex or unsolvable problem.
a sharp increase in growth after a period of slow progress
thinking in a new, innovative, or creative way
