1876650 jmdict A [id=1141677]
腰を据える；腰をすえる
こしをすえる
[1][exp,v1]
  to settle down (and deal with something); to concentrate all one's energy (on something)
[2][exp,v1]
  to settle oneself (in a place); to settle down (somewhere); to settle in
[3][exp,v1]
  to take a solid stance; to lower one's center of gravity (centre)