Answer: infix

AnswerCrossword Clue
INFIXImplant, as an idea
INFIXFasten firmly
infixto fix in, also ENFIX
infix(of a linguistic form) to admit an infix
infixto implant
infixto fix, fasten, or drive in
infixto instill (a fact, idea, etc.) in the mind or memory; impress