preposition “on”
- positioned at the upper surface of
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The cat is sleeping on the warm hood of the car.
- attached to
There is a painting on the wall.
- expressing figurative placement, burden, or attachment
The blame for the mistake fell squarely on her shoulders.
- denoting an action done by contact with the surface of something
She drew a heart on the foggy window with her finger.
- at or in a certain region or location
The grocery store is on Maple Street.
- near, alongside
The boat is on the coast.
- supported by the specified part of itself
The cat slept on its back in the warm sunlight.
- imparting force to
Pull on the door handle to open it.
- impacting against
I bumped my head on the low doorway as I entered the room.
- covering
She placed a warm hat on her head before stepping outside.
- inside a vehicle of public transport for the purpose of travelling
She was on the train reading a book when the announcement came through.
- at the date of
The meeting is scheduled on March 15th.
- sometime during the given day
We're having a picnic on Saturday.
- dealing with the subject of
She attended a lecture on quantum physics.
- in the possession of
Sorry, I can't lend you a pen; I don't have one on me right now.
- because of; due to; upon the basis of something not yet confirmed as true
The teacher called her parents on the assumption that she had cheated on the test.
- paid for by
Lunch is on the company today, so order whatever you like!
- indicating a means or medium
She listened to her favorite song on the radio.
- indicating the target of, or thing affected by, an event or action
The joke had no effect on him; he didn't even smile.
- indicating a means of subsistence
She managed to get by on her small pension.
- engaged in or occupied with an action or activity
She's on a call right now, can I take a message?
- regularly taking a medicine or drug
He's been on painkillers since the surgery last month.
- under the influence of a medicine or drug
She couldn't focus at work because she was on strong painkillers after her surgery.
- indicating multiplication or succession in a series, e.g. complaints upon complaints
She piled books on books on her desk until it towered dangerously high.
- indicating dependence or reliance
She relied on her GPS to find the way.
- serving as a member of
She's on the school board, so she attends all the meetings.
- swearing on, e.g. on my life, on God
"On my mother's grave, I didn't take your phone."
- against, especially when numbers of combatants or competitors are specified
In the soccer match, it was ten on eleven after one player received a red card.
adjective “on”
base form on, non-gradable
- in the state of being switched on, active or operating
The air conditioning is on; I can feel the cool breeze.
- performing according to schedule; taking place
- fitted; covering; being worn
As soon as the helmet was on, the cyclist felt ready to hit the road.
- having reached a base as a runner and being positioned there, awaiting further action from a subsequent batter
The pitcher looked nervous with runners on second and third, knowing any hit could send them home.
- within the half of the field on the same side as the batsman's legs; the left side for a right-handed batsman
The bowler aimed for the on side, hoping to exploit the batsman's weakness there.
adverb “on”
- in continuation, at length
She kept talking on about her vacation plans, her new recipes, her garden, and her cats.
- to an operating state
Please switch the lights on when you enter the room.
- so as to cover or be fitted
He put his hat on and stepped out into the sun.
- continuing an action
Keep on walking until you reach the end of the path.
- of betting odds, denoting a better-than-even chance
The boxer was ten-to-one on to win the match, indicating he was heavily favored by the bookmakers.