wheel
noun /wiːl/
  /wiːl/
Idioms - [countable] one of the round objects under a car, bicycle, bus, etc. that turns when it moves
- He braked suddenly, causing the front wheels to skid.
 - the rear wheels of the car
 - She was killed when she was crushed under the wheels of a bus.
 - I had lightweight wheels on my bike.
 - tractors with powered front wheels
 - on wheels One of the boys was pushing the other along in a little box on wheels.
 
Extra ExamplesTopics Transport by car or lorrya2- A tyre blew and we had to change the wheel.
 - She braked too hard and the wheels locked.
 - She fell under the wheels of a bus.
 - The wheels were still going around.
 - the sound of wheels crunching over snow
 
Oxford Collocations Dictionaryadjective- bicycle
 - car
 - etc.
 - …
 
- change
 - replace
 
- go around
 - go round
 - spin
 - …
 
- arch
 - base
 - bearings
 - …
 
- on wheels
 - under the wheels
 
 - [countable, usually singular] the round object used for controlling the direction in which a car, etc. or ship moves
- Always keep both hands on the wheel.
 - behind the wheel Never get behind the wheel if you're too tired.
 - This is the first time I've sat behind the wheel since the accident.
 - at the wheel A car swept past with Laura at the wheel.
 - Do you want to take the wheel (= drive) now?
 - She fell asleep at the wheel and crashed into a tree.
 
Extra ExamplesTopics Transport by waterb1- I drove the first 200 miles and then Steve took the wheel.
 - I saw the car drive past, but didn't recognize the woman behind the wheel.
 - I spend a lot of time behind the wheel.
 - The bus set off again with a fresh driver at the wheel.
 
Oxford Collocations Dictionaryverb + wheel- grip
 - hold
 - turn
 - …
 
- lock
 
- at the wheel
 - behind the wheel
 
- keep your hands on the steering wheel
 - put your hands on the steering wheel
 - take your hands off the steering wheel
 - …
 
 - wheels[plural] (informal) a car
- At last he had his own wheels.
 
 - [countable] a flat, round part in a machine
- gear wheels
 
 - wheels[plural] wheel (of something) an organization or a system that seems to work like a complicated machine that is difficult to understand
- the wheels of bureaucracy/commerce/government
 - It was Rob's idea. I merely set the wheels in motion (= started the process).
 
 - (in adjectives) having the number or type of wheels mentioned
- a sixteen-wheeled lorry
 
 - (in nouns) a car, bicycle, etc. with the number of wheels mentioned
- a three-wheeler
 
Oxford Collocations Dictionaryadjective- bicycle
 - car
 - etc.
 - …
 
- change
 - replace
 
- go around
 - go round
 - spin
 - …
 
- arch
 - base
 - bearings
 - …
 
- on wheels
 - under the wheels
 
 
on/in vehicles
in machine
organization/system
-wheeled
-wheeler
Word OriginOld English hwēol (noun), of Germanic origin, from an Indo-European root shared by Sanskrit cakra ‘wheel, circle’ and Greek kuklos ‘circle’.
Idioms 
asleep at the wheel | asleep on the job 
(North American English also asleep at the switch)
- not paying enough attention to what you need to do
- Let's hope the regulators are not asleep at the wheel.
 - They were asleep on the job as the financial crisis deepened.
 - Someone must have been asleep at the switch to alow this to happen.
 
 
a cog in the machine/wheel 
- (informal) a person who is a small part of a large organization
 
oil the wheels (British English) 
(North American English grease the wheels)
- to help something to happen easily and without problems, especially in business or politics
 
put your shoulder to the wheel 
- to start working very hard at a particular task
- Everyone is going to have to put their shoulder to the wheel.
 
 
put a spoke in somebody’s wheel 
- (British English) to prevent somebody from putting their plans into operation                                     
 
reinvent the wheel 
- to waste time creating something that already exists and works well
- There’s no point in us reinventing the wheel.
 
 
wheels within wheels 
- a situation that is difficult to understand because it involves complicated or secret processes and decisions
- There are wheels within wheels in this organization—you never really know what is going on.