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

Note: 
Neither expression is equivalent in meaning to the phrase
jump someone
—(sl.) 
1
. attack smb. suddenly in a sneaky fashion
(with the intention to rob, etc.): When I “jumped” him we
didn’t mean to kill or hurt him. 2. cheat or swindle a person:
The old proprietor … was green, and let the boys about here
jump him.
jump at something • jump on something
jump at something —accept an offer, opportunity, etc.
eagerly as soon as it has become available: When I raised this
prospect with her, she jumped at the idea.
jump on something —(also: jump all over something) reprove
or criticize smth. severely: Critics jumped on the 
1
998 release
of the instruction manual for priesthood.
jump in the lake • take the plunge
jump in the lake —(also: go jump in the lake) is used to rudely
tell a person to go away (and stop being annoying): After a
while, our exchange turned hostile and I told him to jump in
the lake.
take the plunge —take a decisive step (especially getting mar-
ried); venture to do smth. risky: You may take the plunge and
start your own firm, or join a large company.
jump out of one’s skin • run out of one’s skin
jump out of one’s skin—
1
. get a sudden unpleasant shock or
surprise: He nearly jumped out of his skin when he saw two
rats in the wreckage of what a few years before had been a
kitchen. 2. show extreme delight, excitement, or high spirits:
Scipio was ready to jump out of his skin for joy at the sight
of me. 3. (of a horse) put all of one’s energy into a race: The
horse looked in splendid condition, “fit to jump out of his
skin,” to use a racing term.
run out of one’s skin — = jump out of one’s skin 3: The word
from Ireland this week is that this horse is running out of its
skin over the flat.