qiè
secretly
Original meaning:
to steal rice
Phonosemantic compound. 穴 represents the meaning and 䊪 represents the sound. Based on the original meaning "to steal rice". The meaning of this character has shifted over time and now means "secretly".
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernSources
李学勤《字源》p.648
季旭昇《說文新證》p.580-581