take leave of one's senses

/T EY1 K L IY0 V AH0 V W AH0 N EH0 S EH0 N S IH0 Z/
verb
  1. 1

    To go crazy; to stop behaving rationally.

Source: https://en.wiktionary.org/wiki/take%20leave%20of%20one's%20senses