百折不挠
Fight for it tooth and nail.
Get at it hammer and tongs.
Never say die.
Stick it out.
eg:If Tom wants to win the scholarship, he has to fight for it tooth and nail in studying all text books.
中英俚语俗语来源:“汉·蔡邕有百折不挠,临大节而不可夺之风。”
同义词:不屈不挠 Firm and unyielding.
反义词:俯首就范 Give one's head for the washing.