马不停蹄 (mǎ bù tíng tí) | Meaning: unrelenting | Chinese Idiom with Pinyin & Origin

night and day (idiom); continuous strenuous effort夜以继日yè yǐ jì rì

to continue the struggle (idiom); to persist · unremitting efforts再接再厉zài jiē zài lì

to spur the horse to full speed (idiom) · to go as fast as possible快马加鞭kuài mǎ jiā biān

(idiom) terribly busy · up to one's ears in work疲于奔命pí yú bēn mìng

unrelenting · without stopping to rest