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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a scrap or morsel of food left at a meal. |
at the mercy of
Also, . Subject to the power of, helpless against, as in The captured rebels were at the mercy of the army commander. [Late 1500s]
Without any protection against, as in On top of Mount Washington we were at the mercy of the elements. [Late 1600s]