idea

1 ENTRIES FOUND:
idea /aɪˈdiːjə/ noun
plural ideas
idea
/aɪˈdiːjə/
noun
plural ideas
Britannica Dictionary definition of IDEA
1 
[count] : a thought, plan, or suggestion about what to do
2 
[count] : an opinion or belief
3 
: something that you imagine or picture in your mind
[count]
[noncount]
4 
[singular] : an understanding of something : knowledge about something
5 
the idea : the central meaning or purpose of something

give someone ideas

or put ideas in/into someone's head
: to cause someone to think about doing something that probably should not be done