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

it’s a case • this is not the case
it’s a case —(coll.) said of people who are in love: “One never
sees anything of John now; he’s always with that girl of his.”
“Yes, it’s a case all right.”
this is not the case —it is not so; it is not true: Numerous
organisms pass their whole life hovering in the ocean, while
with others this is not the case.
it’s all go • it’s all the go
it’s all go —(coll.) said when people are very busy or engaged
in vigorous activity: It’s all go in the postal service at Christ-
mas time!
Note: 
The expression does not correlate in meaning with the
phrase all systems go—(derives from the U.S. space program)
used as a statement of preparedness for an endeavor: Fund raising
was the most laborious part. But finally it was in place and it
was all systems go.
it’s all the go —(coll.) it is very fashionable: “Just a little
chasse-café,” said he…. “It’s all the go now; and a capital thing
for the stomach.”
See also: it’s no go / it’s not a go.
it’s all in a day’s work • it’s all part of the game
it’s all in a day’s work —one doesn’t mind doing smth.
because it is smth. to be normally expected: “It’s very good of
you to bother….” “Please don’t mention it,” I said, rather
stiffly. “It’s all in a day’s work.”
it’s all part of the game —is used to tell that smth. is normal
in the situation: “It’s all part of the game.” That’s the attitude
of Tim Drew as his baseball career took a dramatic upswing
and downturn all in the span of a few weeks.
iron lady
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it’s all over with someone • it’s someone all over
it’s all over with someone —
1
. said of smb. who is completely
finished: It’s all over with me…. I can bang off a popular song
in the cabarets, perhaps; but that’s all. 2. said of a person who
is dying: When he heard Bambi coming he ceased his convul-
sive movements and whispered: “It’s all over with me.”
it’s someone all over —it’s very typical of the person men-
tioned: “We might not be able to prove it, but we strongly
suspect it’s Dupas … it’s him all over,” a police source said.