dig (your) heels in

to refuse to do what other people are trying to persuade you to do, especially to refuse to change your opinions or plans.

We suggested it would be quicker to fly, but she dug her heels in and insisted on taking the train.

• have a leg up on someone
• have a line on
• have a line on someone
• have a line on something
• have all marbles
• have all the aces
• have all the answers
• have all the cards
• have all the makings of
• have all the makings of something
• have all your marbles
• have a lot going for
• have a lot going for you
• have a lot irons in the fire
• have [a lot of/a few/several etc.] strings to bow
• have [a lot of/a few/several etc.] strings to your bow
• have a lot of strings to bow
• have a lot of strings to your bow
• have a lot of time for
• have a lot of time for someone
• have a lot of time for something
• have a lot on plate
• have a lot on your plate
• have a lot to answer for
• have a memory like an elephant