Put one's foot down:
把腳(jiǎo)放下 ×
下定決(jué)心 √
例句 ：
I shall have to put my foot down and stop this nonsense.
我必須採(cǎi)取堅(jiān)定的态度 ，制止這一荒謬的事情。
Keep one's feet on the ground:
腳(jiǎo)踏實(shí)地 √
例句：
Keep your eyes on the stars, and your feet on the ground.
目光高遠，腳(jiǎo)踏實(shí)地。
Stand on one's own feet:
用自己的腳(jiǎo)站著(zhe) ×
自力更生 √
例句：
I hope you can stand on your own feet.
我希望你能夠獨立自主。
