Dig (one's) heels in negative verb phrase
When someone "dig their heels in", it means that he/she aggressively persist on his/her own thoughts, beliefs or points of view, etc. and refuse to change them although they was persuaded to do so.
Don't waste your time with her, she digs her heels in and never listens to you.
I won't elect him, because he's a person digging his heels in and a respected politician is the one who needs to listens to citizens' voices, selects and adjusts them to create a more convenient life for people.
My father used to be a person digging his heels in, but now he more understands and sympathizes with us, with today's lifestyle.
Used to describe someone who is good at persuading people to do or believe something
Show fortitude, and determination of character
It means people cannot change their nature like personalities, habits, etc.
A despicable person who does unscrupulous or immoral things
Someone is not as bad, cruel, maleficent as they are said or believed to be.
This phrase should be conjugated according to its Subject and the sentence's Tense.
Notice: do not have any misinterpretation between this phrase and the one "drag one's heels" (act slowly with no enthusiasm to delay.)
This idiom probably originated from the act placing one’s heels in the ground in tug of war (pulling).
King George V's last words