go pear-shaped
To go awry; to go wrong.
After the third attack run I was letting back down to low level, passing through about 100 feet on the way down, when there were two bangs very close together. The whole aircraft s
adj
Having a shape of a (typical western) pear, or in cross-section, like the cross-section of a pear.
Single egg laid directly on ledge, pear-shaped to prevent rolling off[.]
Having a shape of a (typical western) pear, or in cross-section, like the cross-section of a pear.
pear-shaped obesity versus apple-shaped obesity
Just as one should take sitting-up exercises every day to keep one's figure from going pear-shaped in the hips, one should spend at least a little time, even if it is only very little, sloughing off mental flabbiness by thinking, studying or just reading something that requires an exercising effort of the mind to understand, memorise or digest.
rich, mellow, sonorous
Wrong, awry, usually in the phrase go pear-shaped.