get it into (your) head

to begin to think that something is true.

Charles somehow got it into his head that I was an athlete.

She got the notion into her head that we should buy the place.

• feel under the weather
• feel up
• feel way
• feel your oats
• feel your way
• feet of clay
• feet on the ground
• femme fatale
• fender bender
• fend for
• fend for yourself
• fend off
• fend off someone
• fend off something
• ferret out
• ferret out something
• fever pitch
• few and far between
• few fries short of a Happy Meal
• fiddle away
• fiddle away something
• fiddle while Rome burns
• fiddle with
• fiddle with something
• fifth wheel