Abide by one's opinion.
Stick to one's gun.
Take the bit in one's teeth .
Have a will of one's own.
Nail one' s colours to the mast.
eg:The man was obstinate enough to abide by his opinion.
中英俚語俗語來源:宋史·陳宓傳:"固執(zhí)己見,動失人心。 "
同義詞:剛惺自用 Reckon without one's host.
反義詞:收回成命 Eat one' s words.