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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 screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| back down | |
| —vb | |
| 1. | (intr, adverb) to withdraw an earlier claim |
| 2. | (tr) rowing to cause (a boat) to move backwards by pushing rather than pulling on the oars |
| —n | |
| 3. | abandonment of an earlier claim |
back (bāk)
n.
The posterior portion of the trunk of the human body between the neck and the pelvis; the dorsum.
The backbone or spine.
back definition
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back down
Reverse one's upward course, descend. For example, When she saw the wasps' nest on the roof, she hastily backed down the ladder. This literal usage usually refers to something one has climbed, such as a ladder or mountain. [Mid-1800s]
Also, back off. Retreat or yield. For example, As the watchdog began to snarl the letter carrier backed off, or You have a good point; now don't back down when you present it to the board. [First half of 1900s] Also see back away, def. 2.