preposition
touching and being supported by the top surface of (something)
to a position that is supported by (something)
c - used to indicate the part or object by which someone or something is supported
used to say that something is attached to something
used to indicate where someone or something is hit or touched
a - used to indicate the surface or part where something is seen or located
b - used to say that something (such as jewelry) is being worn by someone
near or close to (something or someone)
used to indicate the location or position of something or someone
used to indicate the time when something happened or will happen
immediately after (something)
used to indicate the subject of something
a - used to indicate the device or instrument that is used to do something
b - used to say that someone is using a telephone, computer, etc.
c - used to describe the device, system, etc., that is used for seeing something, hearing something, etc.
used to indicate a source of something (such as money, food, information, or energy)
used to indicate the vehicle or animal by which someone or something is moved from one place to another
used to say that you have something in your possession at a particular time
used to indicate the state of something
used to indicate an activity that someone did or is now doing
used to indicate something (such as a medicine or drug) that a person or animal is using
used to indicate the person or thing that is responsible for something
a - used to indicate the person or thing that something is directed toward
b - used to say that someone has been affected by something
used after an adjective to indicate the thing that a statement relates to
as stated or shown by (someone or something)
used to indicate that someone or something is included as part of a team, list, etc.
used to say that someone or something has an advantage
chiefly US - used to say that someone is playing or performing well
on about
Brit informal + disapproving :talking about
on at
Brit informal
asking (someone) for something repeatedly and in a way that is annoying
asking or telling (someone) to do something repeatedly and in a way that is annoying
on it
actively dealing with a problem, job, etc.
adverb
a - used to indicate that something is attached to, covering, or supported by something else
b - used to describe something that is being worn by someone
used to indicate movement forward
a - used to indicate that an activity, event, or condition continues
in an advanced state
at a more advanced time :at a later time
from one person or thing to another
a - used to indicate that something is operating, flowing, etc.
b - used to indicate that something is being heated, prepared, etc.
in or into a train, bus, etc.
on and off
adjective
not used before a noun :attached to or covering something
not used before a noun :performing or speaking in public
not used before a noun :working at a job
a not used before a noun :operating or flowing
in a position that starts the flow of electricity, water, etc.
not used before a noun
taking place or happening
doing something as planned
not used before a noun :being broadcast on television or radio
not used before a noun chiefly US - used to say that you are able to do something well at a particular time
not on
Brit informal
not acceptable or proper
not possible
you're on
informal - used to say that you accept a bet or challenge
US