lit. like the man of 杞[Qi3] who feared the sky would fall (idiom); fig
杞 · 7 strokes
Phonosemantic compound. 木 represents the meaning and 己 represents the sound.
人 · 2 strokes
Pictograph of the side view of a standing person.
忧 · 7 strokes
Phonosemantic compound. 忄 represents the meaning and 尤 represents the sound. Simplified form of 憂.
天 · 4 strokes
Depicts a person (大) with an emphasized head. Based on the original meaning "head". The meaning later shifted to "top", "high", and "sky".
别杞人忧天了，事情没那么糟糕。
Don't worry needlessly; things aren't that bad.