See ↑ IDEA 1,3, ↑ PURPOSE 1
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• ↑ be a good idea
• ↑ bright idea
• ↑ get an idea
• ↑ get the impression/feeling/idea
• ↑ have an idea
• ↑ have no idea/not have a clue
• ↑ it's/that's a good idea
• ↑ not have the faintest/slightest/foggiest idea
• ↑ toy with the idea of