I am severely allergic to shellfish.

to sew/stitch up a deal

sexpot

sexy number

to shack up together

shade

shades

to be a shadow of one’s former self

shadow economy

to shadow forth

shadow boxing

shady character

a shady business

shady dealings

shady past

shady side

to shaft someone

shaft

to shaft/shag

to shag someone

to shake in one’s boots/shoes

to shake off slavery

to shake the pagoda

Shake hands on it!

Shake on it!