on sight

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/ɒn ˈsaɪt/
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A phrase meaning something happens or is recognized instantly, whether it’s a quick identification or an immediate reaction, often used informally.
Practice using this word in conversation

Examples

  • She could spot the rare bird on sight during the hike.
  • If anyone insults me, I’ll deal with them on sight.
  • He promised to shut down the spam account on sight.
  • The veteran driver identified the car model on sight.
  • When the logo appeared, I knew the brand on sight.

Similar words

forthwith
at once
immediately
right away
promptly
at once
without hesitation
instantly
promptly
forthwith

Meanings

Recognize immediately

everyday
informal
To notice or identify someone or something as soon as it is seen.

Usage

Use on sight when you want to say you recognized something instantly.

Examples

  • I recognized him on sight as soon as he entered the room.
  • She could spot the rare bird on sight during the hike.
  • The security guard knew the thief on sight.
  • When the logo appeared, I knew the brand on sight.
  • He could name the actor on sight after just one glance.
  • The veteran driver identified the car model on sight.

Common mistakes

The phrase is often altered or used for delayed recognition.
IncorrectCorrect
I saw him on sighted. I saw him on sight.
We will meet on sight tomorrow. We will meet on sight tomorrow.
He recognized the word on sighting. He recognized the word on sight.
She identified the plant on sightly. She identified the plant on sight.

Similar words

instantly
immediately
right away
straightaway
promptly
at once
without delay
forthwith

Act immediately upon seeing

online
informal
To take action or respond the moment someone or something is seen, often used humorously online.

Usage

Use on sight for jokes about instant retaliation or swift response.

Examples

  • If anyone insults me, I’ll deal with them on sight.
  • The gamer will attack the opponent on sight as soon as they appear.
  • He promised to shut down the spam account on sight.
  • The police will arrest the suspect on sight once identified.
  • She said she’d correct the mistake on sight.
  • The coach will substitute the player on sight if he gets a red card.

Common mistakes

The idiom is sometimes changed to 'on sighted' or applied to delayed actions.
IncorrectCorrect
He will respond on sighted. He will respond on sight.
They will act on sight later. They will act on sight.
I will do it on sighted. I will do it on sight.
She will punish him on sighting. She will punish him on sight.

Similar words

immediately
right away
straight away
without hesitation
instantly
promptly
at once
forthwith

Usage

Choose the sense that fits the context: use it for instant recognition or for an immediate, often joking, response.

Common mistakes

The phrase is often taken literally or altered, such as 'on sighted' or used for delayed actions.

Etymology

From the literal prepositional phrase 'on sight', recorded in English since the early 19th century to mean immediate recognition, later broadened to cover instant action, especially in informal and online contexts.

FAQ

What does on sight mean?

On sight means something happens instantly when you see it, either you recognize it right away or you act immediately.

How is on sight used in a sentence?

You can say, "I recognized the logo on sight," or "I’ll deal with the troublemaker on sight."

Can on sight refer to future actions?

Yes, it can describe an action you will take the moment you see the person or situation.

Is on sight formal or informal?

It is informal and is common in spoken English and online slang.

Does on sight have a literal meaning?

Literally it means "upon seeing," but idiomatically it conveys immediacy.

What are common mistakes with on sight?

People often change the phrase to "on sighted" or use it for actions that are not immediate.

Is on sight the same as "at first glance"?

Both can describe quick recognition, but "at first glance" is neutral, while on sight often adds a sense of immediacy.

Can on sight be used in legal contexts?

It is rarely used in formal legal language; more casual contexts are typical.

Where does the idiom on sight come from?

It originates from the literal phrase "on sight" used since the early 1800s, later becoming an idiom for instant recognition or reaction.

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