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

sicken at something • sicken for something •
sicken of something
sicken at something —experience strong revulsion at smth.:
The four of us who sickened at the idea of partaking of the
horrid meal withdrew to the seclusion of our tent.
sicken for something —be in the early stages of a disease (not
yet manifest): “I’d rather be at home,” said the cameraman.
“I’m definitely sickening for something.”
sicken of something —grow bored or tired of smth.: There
must come a time in each person’s life, when they sicken of
their seemingly purposeless existence.
side boy • sideman
side boy —(Navy) one of the crew detailed to stand at the
gangway as a mark of respect to a person arriving: Shipmate
Talbot was nominated “side boy” for the evening and he piped
the Mayor aboard.
sideman —( Jazz) a supporting instrumentalist: He began
playing in bands just a few years later, and was soon accepted
as a desirable sideman.
side-step • step aside
side-step —
1
. step to one side : Sophia sidestepped and
walked sharply past Charles. 2. deviate from the direct route:
I was glad I side-stepped, for the journey was worth a devia-
tion. 3. avoid an issue, etc.: I’ve even asked Dinwater that flat
out on two occasions. But he’s always side-stepped.
step aside —
1
. = side-step 
1
: He will leave his rifle on the rest
and step aside, in order that the instructor may take his place.
2. withdraw from a competition, etc.: I feel that when there
are so many better people for the chairmanship, I should step
aside.
sigh about something • sigh for something
sigh about something —express some sad feeling on account
of smth.: It’s no good sighing about your failure, it’s better to
start again.
sigh for something —desire smth. very much: Many a woman
sighs for a house of her own.