An upswing is a movement upward — but almost always used about a number, a level, or a mood, not about a real object moving through the air. When business gets better after a bad time, that is an upswing. When prices, sales, visitor numbers, or a team's results start climbing again, people call it an upswing. The word carries a feeling of a curve on a graph: the line went down for a while, and now it is going up. That is important — an upswing usually suggests a change of direction, a recovery, not just growth that was always there. You often meet it in news and business writing: 'an upswing in the economy', 'an upswing in demand for used cars'. It is not a formal or difficult word, but it does belong more to writing and reporting than to daily chat; a friend telling you about their shop would more likely say 'things are picking up'. It can also be used about feelings and health — 'an upswing in his mood' — where it means a period of feeling better, and this is common when people talk about mental health. There is a matching word, downswing, but it is much less common; people usually say downturn instead. The pattern to remember is 'an upswing in + noun'.