挺腰

tǐngyāo
  1. to straighten one's back
  2. to arch one's back

CEDICT

撐直腰部舒活筋骨。

重編國語辭典

Entry Composition

1 挺 tǐng
  1. straight
  2. erect
  3. to stick out (a part of the body)
  4. to (physically) straighten up
  5. to support
  6. to withstand
  7. outstanding
  8. (coll.) quite
  9. very
  10. classifier for machine guns
2 腰 yāo
  1. the waist and lower back
  2. (bound form) kidney of an animal (as food)
  3. the waist of trousers or a skirt
  4. (metonym) money pouch; pocket
  5. (bound form) the middle section of an upright object (mountain, bottle etc)

Related entries

挺身 tǐngshēn to straighten one's back
弓背 gōngbèi
  1. to hunch over
  2. to stoop
  3. to arch one's back (upward)