What is the meaning of Beater?

Someone or something that beats.

A kitchen implement for mixing.

A stick used to play a percussion instrument.

A person who drives game towards shooters in a hunting party, typically working in a group with other beaters.

A papermaking machine for processing fibres by fibrillation in order to improve bonding strength

An old or dilapidated automobile in poor operating condition.

A weaving tool designed to push the weft yarn securely into place. It contains the comb-like insert reed and is sometimes a part of the loom.

In the sport Quidditch or Muggle quidditch, a player a who attempts to hit the opposing team's players with bludgers and to block the bludgers from hitting their own team's players.

A harp seal pup after its first moult and before its second moult.

A shoe suitable for everyday wear, during which they may get dirty or scuffed, as opposed to more valuable shoes that one wishes to keep in good condition.

A sleeveless undershirt.

Source: wiktionary.org