The act of using language to sneak your preferred concept into the minds of others, and in turn, get them to agree with you or to think like you. This can be done by crafting narratives, redefining words, or by creating new words to manipulate the listener.
A prime example is the recent redefinition of the word racism. By changing the definition from racial prejudice, to a system and participants in that system, the entire library of books, speeches, and media dedicated to eradicating the racial prejudice, are now hijacked and used to attack whatever woke people deem to be "part of the system" (whatever that may be).
Through idea smuggling, you can coerce support out of beleaguered and docile people. Just name your group "The puppy rescue organization" and then do whatever you want. When someone criticizes your group, accuse them of hating puppies and standing in the way of rescuing them.