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to sell someone out

to sell someone out

109 5.9
Betray someone by telling their secrets to others for personal gain
  • phrasal verb
  • /sɛl ˈsʌmˌwʌn aʊt/
  • Informal
translation icon : vender a alguien
  • He sold his friends out by leaking their plans to the rival team.

Examples

  • The people that are supposed to represent us have sold us out to special interests.

    Blog text (13)
  • Conner's selling us out.

  • I knew you were gonna sell me out.

  • But he sold you out.

  • An ally who can be bought will sell you out for a higher price.

    Blog text (4)
  • I'm about to sell you out!

  • What makes you so special that he won't sell you out too?

    Blog text (4)
  • I cannot believe you have such turncoat politicians who are selling out American families for money.

    Blog text (17)
  • The list of issues that 'pragmatists' are willing to sell out their fellow Democratic voters is long.

    Blog text (12)
  • They're selling you out, sonny.

Synonyms

to sell
vsto sell someone out
  • Informal
642 7.9

To betray someone for personal gain

also includes revealing secrets or refusing support rather than only giving someone up
to betray
vsto sell someone out
143 4.6

Tell someone's secret to other people

also covers failing to support others and often implies personal gain
to give away
vsto sell someone out
114 3.4

Tell a secret on purpose or by accident

usually implies intentional harm or personal advantage rather than accidental disclosure
to rat out
vsto sell someone out
  • Informal
76 8.6

To tell the police or another authority about someone's bad action, betraying their trust

focuses less on reporting and more on personal gain or refusal to help
to sell down the river
vsto sell someone out
  • Informal
12 8.8

To betray someone to get something for yourself

is similar but also includes revealing confidential information or refusing help

Antonyms

1.0

Give help to a person or idea

187 3.2

Support someone through difficult times

How Disloyal

to sell someone out
  • Informal
109 5.9
to backstab
  • Informal
5 6.6
to betray
143 4.6
to let down
210 2.9

Surface Forms

sell someone out infinitive
sold someone out past participle
selling someone out present participle
sells someone out third person singular

Morphology

sell + someone + out

The verb 'sell' can have a metaphorical sense of abandoning or betraying and the particle 'out' means to expose, so combining them with 'someone' yields a clear clue toward betraying or exposing a person. However, the specific nuance — betraying by revealing confidential information or failing to support someone for personal gain — is somewhat idiomatic and may not be fully predictable for a B1 learner without prior exposure.

Etymology

The phrasal verb sell someone out comes from the simple image of sell and out: imagine handing a friend to the police or an enemy for money or a reward, so they are exposed. So the phrase now means 'to betray someone, often for personal gain'.