- ((make)) a sudden change
豹変する 〔急変する〕change suddenly;〔主義などを〕do an about-face,《英》 do an about-turn, do a complete turn around, do a 180 degree turn
- 当選すると彼は豹変して保守派に転じた
- Once he was elected, he did 「an about-face [a political flip-flop] and became a conservative.