A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

turn someone’s brain • turn someone’s head
turn someone’s brain —
1
. cause mental disorder: The only
possible explanation was that the poor girl’s illness and the
loss of her lover had turned her brain. 2. make a person wildly
agitated or distraught: Too much of this sort of work turns
your brain.
turn someone’s head —
1
. cause a person to have too high an
opinion of oneself: She is a famous actress but she has not
allowed success to turn her head. 2. cause a person to become
infatuated: You have been making serious love to Patty, and
have turned the poor girl’s head. 3. create a sensation of gid-
diness: To look down from a great height is enough to turn
one’s head.
Note: 
The expression does not correlate in meaning with the
phrase turn heads—strongly impress people (by looking very
attractive): Cher turned heads when she appeared at the cer-
emony in a dress that left little to the imagination.
turn something on its head • turn something
 upside down
turn something on its head —(also: stand something on its head)
cause a complete reversal of what is regarded as the norm:
Suddenly, Jayne’s once sane life is turned on its head, and not
even her closest friends are what they seem.
turn something upside down —
1
. reverse smth. physically:
Wolfe uncorked the bottle and turned it upside down. The
water splashed the stones at Turrell’s feet. 2. = turn something
on its head: That would have turned charity tax law upside
down. 3. search everywhere in a place, especially roughly: The
police turned his flat upside down looking for drugs.
twin set • two-piece set
twin set—a woman’s sleeveless sweater and cardigan of the
same color and style that are worn together: I thought of wear-
ing a twin set to a symphony concert.
two-piece set—(also: two-piece) a set of clothes of similar or
matching material: Pajamas are usually sold as a two piece set
with matching tops and bottoms.