手を染める be involved●get one's feet wet

手を染める〔~に〕 get [become] involved (in)●get a first taste of●have a hand (in)●meddle in●meddle with●put a hand to

手を染める〔悪事に〕 【自動】engage

手を染めることへの(人)の不安を和らげる〔~に〕 ease someone's concerns over getting involved in