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.

Examples

  • She said she’d correct the mistake on sight.
  • He promised to shut down the spam account on sight.
  • The police will arrest the suspect on sight once identified.
  • She could spot the rare bird on sight during the hike.
  • The gamer will attack the opponent on sight as soon as they appear.

Similar words

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

Meanings

Recognize immediately

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

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.

Similar words

Act immediately upon seeing

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

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.

Similar words

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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