He devised several plans. If you're talking about the troll scene from the movie, An Unexpected Journey, he came up with reasons why the trolls shouldn't eat the dwarves, such as them having parasites. The intention was to keep them occupied until the sun shone on them and turned them to stone. If you're talking about the part with the elves of Mirkwood in the second movie, The Desolation of Smaug, and in the book, he stole the keys and led all the dwarves to an area with some empty barrels, and pushed a lever to release them into the river below. If you're talking about the part with the Arkenstone in the third movie, The Battle of Five Armies, and in the book, he decides to take the Arkenstone to Thranduil (the elven king of Mirkwood) and Bard as his share of the treasure, and gives it to them so that they can trade it to Thorin in exchange for a share in the treasure of the Lonely Mountain, therefore avoiding war.
The group had to devise a plan, and fast!
Devise means to construct, create, or elaborate on something. When used in the context of a plan, as in "devise a plan", it means "create a plan".
(verb - to design or plan) I will devise a plan to thwart the competition and rule the universe! I'm just not certain that the answer I would devise will be satisfactory. How did Eisenhower devise the plan for D-Day? Who will devise the next vise? (noun - legal clause) Harry left a devise in his will, leaving all his property to charity.
TO contrive, plan, or elaborate; invent from existing principles or ideas: to devise a method.
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I will devise an effective plan for eliminating the pests.
We need to devise a plan to get mom out of the house so we can decorate for her surprise party. Did General Washington devise a plan to expose Benedict Arnold's treasonous activities? Somehow, Dad was able to devise a way to shut off the lights without getting out of bed.
Devise is a verb which means to plan/invent, e.g. He needed to devise a plan. Device is a noun which means a tool or contraption of some form, e.g. His newly built device worked perfectly.
The word devise, used as a verb, means to form by creating new things or ideas. It can also mean to plan or bring about. Devise when used as a noun means the act of disposing of property with a will.
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The correct spelling is "design" (to plan or devise).
Bilbo's escape plan is mediocre. He risked the lives of the dwarves while trying to carry it out.