go pear-shaped

:  to move on a course :  proceed — compare stop

:  to move out of or away from a place expressed or implied :  leave, depart

:  to take a certain course or follow a certain procedure

:  the act or manner of going

:  the height of fashion :  rage

:  an often unexpected turn of affairs :  occurrence

:  functioning properly :  being in good and ready condition

:  a game played between two players who alternately place black and white stones on a board checkered by 19 vertical lines and 19 horizontal lines in an attempt to enclose the larger area on the board

:  having an oval shape markedly tapering at one end

:  free from harshness, thinness, or nasality