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

be in with someone • be with someone
be in with someone —(coll., also: be on the in with someone)
be on friendly or familiar terms with a person: We go along
for a drink occasionally, but we’re not really in with the people
staying there. Cf.: be out with someone —(coll., also: be on the
outs with someone) be no longer friendly with a person: He is out
with his former friend and in with his former adversary.
be with someone —(coll.) 
1
. pay attention to what a person is
saying: Are you still with me — or shall I go over it again? 2.
support a person; back smb. up: If you do decide to oppose
him, then we’re with you all the way!
See also: have an in with someone / have it in for someone.
be interested in someone • have an interest in
someone
be interested in someone —be keen to know or learn about a
person: I do not suppose that George was interested in Steven-
son as a writing man.
have an interest in someone —concern oneself about or sym-
pathize with smb.: She happens to be my only sister’s child
and I have an interest in her.
Note: 
Neither expression correlates in meaning with the phrase
interest oneself for someone
— seek attention for another person:
I will interest myself for you and try to obtain a promise of
the post.
be laid low • lie low
be laid low —
1
. (of a disease or injury) cause a person to take
to bed: I’ve been laid low with this cough most of the winter.
2. be defeated or forced into a humble position: Kidd was laid
low by an incredible run of sheer bad luck.
Note: 
a) The expression does not correlate in meaning with the
phrase be low— feel weak or depressed; be in low spirits: I am low
today. What is it that makes one day good and another bad?
b) The expression is not antonymous in meaning to the phrase
be laid up
—
1
. = be laid low 
1
: The test pilot, Robert Turner,
was laid up with back injuries for months. 2. (of a ship) be put
in dock, as for repairs: In 
1
9
1
0 she stranded in Singapore and
was laid up with hull damage.
lie low —keep a low profile; try to be inconspicuous: Sarah
decided to lie low until the train got underway again.