Drop in
Bow and fall, is a Chinese vocabulary, Pinyin is g ǒ ngsh ǒ u é RXi á ng, meaning bow and surrender respectfully. It's from Ju Shou Pai by Wu Mingshi in Yuan Dynasty.
The origin of Idioms
In Yuan Dynasty, the first fold of Wu Mingshi's "Ju Shou Pai" is: "chop Han General Tang Shui Rui Xue, and don't worry about killing enemy soldiers."
Idiom usage
Not to resist. example we want him to bow down and win without a fight.
Drop in
The difference between the past and the present - qù jiù zhī fēn
too great pleasure will bring about sadness - lè jí shēng bēi
the foot does not dip in the ground - jiǎo bù zhān dì