Kicking oneself over something is an expression that is used to describe the feeling of REGRET or remorse for a mistake or bad decision. The crossword solutions for the term 'kick oneself over' are 'RUE' (3 letters) and 'REGRET' (6 letters). RUE is defined as a feeling of deep sorrow or REGRET, while REGRET is defined as a feeling of sadness, repentance, or disappointment over something that one has done or failed to do. Both words can be used to describe the feeling of kicking oneself over something.