No matter how carefully a project is planned, something may still go wrong with it. The saying is adapted from a line in “To a Mouse,” by Robert Burns: “The best laid schemes o' mice an' men / Gang aft a-gley.”
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| a scrap or morsel of food left at a meal. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |