心事重重

xīn shì chóng chóng

weighed down by worries

Character by character

心xīn
heart

事shì
matters

重chóng
layer

重chóng
upon layer

他这几天心事重重的，饭都吃不下。

He’s had a lot on his mind lately and can barely eat.

Tone: neutral.

重 is chóng (layer upon layer) here, not zhòng.

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