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

get it off with someone • get off with someone
get it off with someone —(sl.) have sex with a person (also:
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get it off with someone

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get it on with someone): She said all he wanted was to get it off
with just anybody.
get off with someone —(coll.) 
1
. move aside with a person to
discuss smth.: We got off with the client and explained the
offer a little better. 2. become friendly with one of the opposite
sex: What fun it would be if one of us could get off with him.
Note:
The expression does not correlate in meaning with the
phrase get off with you—(exclam.) 
1
. is used to rudely tell a per-
son to go away (and stop being annoying ): Get off with you! I’m
trying to work. 2. is used to emphatically express disbelief: Get
off with you! Do you think I’d believe a story like that?
get it on • put it on
get it on —(U.S. sl.)
1
. begin smth. with energy and enthu-
siasm: You want to go for pizza? Let’s get it on! 2. have sex:
Just as they were about to get it on they heard a giggle from
the corner of the dormitory.
put it on —(UK coll.) assume a false appearance; feign smth.:
Billie is just putting it on, and sounds like Americans in movies
where they pretend to be English.
get it on with someone • get on with someone
get it on with someone —(U.S. sl.) have sex with a person
(also: get it off with someone): And it wasn’t only with Prunella:
he had wanted to get it on with Evelyn — Evelyn the Untouch-
able, for Christ’s sake!
get on with someone —maintain a friendly relationship with
smb.; be on good terms with a person: I didn’t get on well
with my parents at all at this stage — they had messed up one
of my best friendships.