The initial idioms of the letter A

a shiver ran up (one's/someone's) spine	a shiver went down (one's/someone's) spine
a shiver went up (one's/someone's) spine	shoestring budget
a shoo-in	a short fuse
short leash	short run
a short sharp shock	quick temper
a short-arse	a shot across the bow
a shot in the arm	a shot in the dark
a shot in the locker	shotgun approach
a shotgun wedding	a shoulder to cry on
show-stopper	a show-stopper
a shrinking violet	a shut mouth catches no flies
shy bladder	sick list
sick note	a/one sick puppy
side effect	side wall
side issue	a siege mentality