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2. Grow a Spine
To get stingy act cranky or grumpy act like a jerk

get sick of
John Bolton grew a spine at the UN Building.

I grew a spine after the Bush speech. grow a spine
1. Grow a Spine
To gain confidence and/or courage.

Reference to the word "spineless" meaning unable to stand up for oneself or lacking in courage.
Person 1: Jane is so spineless. She lets the boss walk all over her.

Person 2: Yeah, Jane needs to grow a spine.
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