butcher:

(plural: ‘butchers‘; pronunciation: the letters ‘bu’ rhyme with the letters ‘bu’ in “bull”, and the letter ‘t’ with the letters ‘ch’ is said with a ‘ch’ sound as in “church”)

some trainee butchers learning the art of butchery

a person who sells meat (flesh of animals), and also kills animals and prepares (dresses) them to sell their meat; (mostly in British usage) a slaughter-man;
a person who is responsible for some disturbance in the society that becomes violent and lot of people die or become wounded;
a political leader, an army officer or a police officer who is responsible for the killings of many people protesting peacefully;
a person who spoils, ruins or disturbs some plan, programme, etc., usually by mistake or because of incompetence;
(old usage & less common) a person who sells things, usually food items, on a train or in a theatre,

Jiverly Voong, known as a butcher for killing several innocent people, USA

e.g.
Mr. Brown, our local butcher, sells very good meat at a very reasonable price.
Honest butchers make good business because people believe butchers’ recommendations and eat what they buy from their local butchers.
Though most food processing companies use machines to do the job of cutting, mincing and packing, they still appoint a number of butchers to dress and prepare the carcasses before sending them into the machines.

Note: ‘Butcher’, always with a capital “B”, is often found in people’s names, e.g. Alan Butcher, Frances Butcher, Mary Butcher, Jim Butcher, etc.

For an informative article on what a butcher is, please click here, and to know how this word is used for people who are responsible for the killings of a large number of people, other than the person who kills animals for a living, please click here.