How to pronounce “buckle under” in English

And what I found amazing after working for him, what I realized was that what I had said kinda didnít matter.He was just testing sort of my strength of character and that I wouldnít buckle under his demands and that when I started working for him I realized that there was this incrediblenetwork of women who worked for him before me and his bookkeeper who was working there at the same time as me and who went to work for him after me.