Do you know these words?

• おむつを　かえる

  to change one's diaper

• おむつを　する

  to wear a diaper ; to put on incontinence underwear

• こしを　あげる

  to raise one's rear end ; to raise one's lower back

• こしを　うかす

  to rise one's lower back

• こしを　うかせる

  to rise one's lower back