Not breathing
Chinese idiom, Pinyin is h ū B ù J ǐ x ī, meaning too scared to breathe. It's from Huainanzi · Bing luexun.
explain
It's too scared to breathe.
source
"Huainanzi · bingluexun" says, "if you squint, you will not breathe."
usage
Used as a predicate or attributive; used in fear, etc.
Not breathing
hide one 's capacities and hide one 's time - tāo guāng liǎn jì