What is the meaning of Sider?

One who takes a side.

Obsolete form of cider.

chest

a woman’s breasts collectively

Hard cider or an analogous beverage made of other fruits.

Any alcoholic beverage of great strength and potency.

indefinite plural of side

cider (alcoholic beverage)

indefinite plural of side

cider (alcoholic beverage)

Source: wiktionary.org