Back on subject, many theories about pearshaped, most are blindly copied without critically analyzing it. Either way it is about a shape that change form when that is not desired, from something circular or cylindrical, that started to bulge/sag. (pottery, gunbarrels, tanks, glassblowing, rivets)
Uphill struggle is just as common. Please could you add?
But usually I read over them aswell. Especially if it just times without an interesting story. (like misreading it as something funny but then realising the mistake so getting them all in time in the last second)