Can someone please tell me what 亮黄灯了 means in this sentence:
我承认,应该是运动量过大,身体亮黄灯了
And why is the colour yellow (黄) used?
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Sign up to join this communityThis probably refers to the orange light (黄灯) in a set of traffic lights.
Essentially when the orange light lights up, it's time to slow down and stop. In this case, it refers to your body switching to the "orange light" (muscle cramps, short of breath and etc...), which is a sign for you to slow down and take a break from excessive exercising.
The color yellow is a sign of warning. Here in your sentence, it is a metaphor of traffic lights (IMO). green->yellow->red
我承认,应该是运动量过大,身体亮黄灯了
the quote 亮黄灯了 means that your body (身体) is warning you, e.g. headache, dizziness or some physical discomfort.
That is a metaphor, a yellow alert for your body conditions. It means your health is going bad, but can be restored by rest and care attention. If it goes to red alert, then your body is in dangerous situation and mostly is about to collapse.