six-monthly

six

to be six feet under

six months

six of one and a half dozen

six of one, half a dozen of the other

to be at sixes and sevens

at sixes and sevens

sixish

sixpack

sixteen

sixth place

sixty

sixty-two

sixty-three

sixty-one

size

to size someone/something up

sizzling hot

skeleton key

a skeleton in the cupboard

Skidoo

skids

Skill comes with practice.

skilled help