English Idiom - Show Some Spine
Today's English idiom is show some spine. Your spine is your backbone, the strong middle bones that support your body. When you tell some one to show some spine or show some backbone, you are telling them to be brave or morally strong. If someone has no backbone or is spineless, it means they are a coward.
Your boss won't take advantage of you if you just show some spine and stand up to her.
Don't be intimidated by him. He's just a bully. Show some spine!
I always thought of Karen as timid, but she really showed some spine in that meeting.