English translation of '腰杆子'

名

1. (口, = 腰部) back
2. (喻, = 靠山) backing
   ⇒ 他腰杆子硬，当然什么都不怕啦！ (Tā yāogǎnzi yìng, dāngrán shénme dōu bù pà la!) He's got very secure backing — of course he doesn't have much to fear!