stop the operation or flow of something by means of a valve, switch, or button.

the work of an engineer (= a person who designs or builds machines, engines, electrical systems, or large structures such as roads or bridges using scientific principles), or the study of this work

to put an instruction or piece of information into your computer by pressing letters, numbers or other keys

a device that measures how far someone has walked by counting the number of times the feet are raised and put down again

a small object used to mark someone's place in some games played on boards

a computer program that is designed for a particular purpose

an object or machine that has been invented for a particular purpose

start the flow or operation of something by means of a valve, switch, or button.