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

leave someone alone • leave someone to oneself
leave someone alone —
1
. go away from a person: Her parents
had gone on holiday for a week, and left us alone in their big
house. 2. (also: let someone alone) abstain from disturbing or
interfering with a person: She yelled at me to go away and
leave her alone. But I ignored her and walked up to her any-
way.
leave someone to oneself — = leave someone alone 2: With his
heart sick and sore, he had resolved to go away and leave her
to herself, as he imagined she wished to be.
leave someone cold • leave someone out in the
cold
leave someone cold —fail to impress or interest a person: An
orator may discourse very eloquently on injustice and leave
his audience cold.
leave someone out in the cold —ignore or abandon smb.:
Developing countries might be left out in the cold in current
world trade talks.
Note: 
The expression does not fully correlate in meaning with
the phrase leave someone out—
1
. = leave someone out in the
cold: It’s Mary’s own fault if she feels left out at the party; she
makes no effort to be friendly to people. 2. fail to include a
person (in a list, etc.): He toasted all the other ladies present,
but left Jane out.
leave someone stew • leave someone stew in one’s
own juice
leave someone stew —(also: let someone stew) keep a person in
a state of uneasy anticipation or suspense: I knew that the
group would be wondering what was going to happen next to
them but I decided to leave them stew on it for a while.
leave someone stew in one’s own juice —(also: let someone stew
in one’s own juice) leave a person to his own devices to suffer
the consequences of his own actions: He’s run into debt again,
but this time we’re leaving him to stew in his own juice.