A knowledge of how to make something work without deeper theoretical understanding of why it works.

(nautical) Any of the sails which are used in most kinds of weather: mainsail, foresail, jib and/or mizzen. Sometimes referred to as the lowers.

Of or pertaining to the working class; suggestive of the working class in manner of speaking, outlook, appearance or other qualities.

(cynology) Any breed of dog developed primarily to assist humans in performing tasks, such as farming, controlling livestock, law enforcement, or assisting the blind.

Any of those days of a week on which work is done. The official working days in many countries are Monday to Friday (even though many people work on weekends).

(Britain) The days of the week that are usually worked on, i.e. Monday to Friday.

The mechanisms that function internally to a system and are not outwardly visible

plural of working week

An animal which is kept mainly to do work, such as a draft animal or a service animal, not mainly as a pet nor for its animal products.

A farm whose agricultural land and buildings are in active use for crop production and/or the raising of livestock.