definition of
[conk out]

[1] #1 conk out v. stop operating or functioning; "The engine finally went"; "The car died on the road"; "The bus we travelled in broke down on the way to town"; "The coffee maker broke"; "The engine failed on the way to town"; "her eyesight went after the accident". wn

[2] #2 conk out v. use up all one's strength and energy and stop working; "At the end of the march, I pooped out". wn