(aerospace) The total mass of the burnt fuel etc. ejected from a rocket to provide thrust.

(idiomatic, euphemistic) A female prostitute. / (rare) Used other than figuratively or idiomatically: see working, girl.

The temporary name of a product or project (such as a film or video game), when under development; often changed when released.

(idiomatic) The technology of making products from leather.

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.