fall behind, to not progress as fast as others, get left behind, to fail to keep up with others and become forgotten, ahead of the curve, becoming more advanced than others, on the cutting edge, the most modern and advanced, take in one’s stride, calmly deal with problems or difficulties, a steep learning curve, a difficult process of learning something new, the tip of the iceberg, only a small visible part of a bigger problem, a can of worms, a situation that creates many new problems, out of the loop, not knowing what is happening, learn the ropes, to understand the basics of something, move the goalposts, changing rules or expectations unfairly.

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