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to cheat on

to cheat on

323 3.3
To have sex with someone who is not your partner
  • phrasal verb
  • /tʃit ɑn/
  • NSFW
translation icon : ser infiel a
  • Long ago, back when they were hardly more than children, my mother cheated on my father.
  • cheat on one's partner
  • cheat on one's husband
  • cheat on one's wife

As it just so happens, Celine's ex cheated on her with Kaya.

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Examples

  • My fiance cheated on me with a dude.

  • My husband Sonny cheated on me in June last year.

  • The title is my husband is cheating on me with my best friend.

  • Do all men cheat on girls?

  • Which is why men and women cheat on each other, I suppose.

    Fiction book (1992)
  • How could you cheat on me with a bum like that?

  • I think my boyfriend's cheating on me with my God sister.

  • So I found my missus is cheating on me, which is bad enough.

  • And then it came out that he'd been cheating on me the whole time pretty much.

  • She caught her boyfriend cheating on her with a co-worker.

Synonyms

to sleep with
vsto cheat on
  • NSFW
652 7.4

To have sex with someone

is specifically about betraying a partner rather than general sexual activity
to cheat
vsto cheat on
  • NSFW
265 4.0

To have sex with someone who is not your partner

uses the phrasal form instead of the single word version
to betray
vsto cheat on
  • NSFW
76 4.6

Have sex with someone who is not your partner

is the casual phrasal expression used in everyday speech
to fool around
vsto cheat on
  • NSFW
35 8.3

To have sex with someone who is not your husband or wife

is the straightforward phrasal verb for unfaithfulness without playfulness focus
to fornicate
vsto cheat on
  • NSFW
19 9.5

To have sex with someone who is not your husband or wife

applies more broadly to unfaithfulness in ongoing relationships not only marriage
two-timing
vsto cheat on
  • NSFW
16 8.0

Having a secret romantic or sexual relationship with someone else while you have a partner

is the general phrasal verb for being unfaithful without stressing secrecy
to sleep around
vsto cheat on
  • NSFW
10 8.8

To have sex with many people without a steady partner

focuses on being unfaithful to a partner rather than casual multiple partners
sleeping around
vsto cheat on
  • NSFW
9 9.1

Having sex with many different people without a steady partner

focuses on betraying a single partner rather than many casual partners
to play around
vsto cheat on
  • NSFW
8 7.9

To have sex with someone outside your relationship

is the direct expression for being unfaithful rather than casual exploration
to lie with
vsto cheat on
  • NSFW
6 9.1

To have sex with someone

refers specifically to being unfaithful within a committed partnership rather than general sex
to step out on
vsto cheat on
  • NSFW
5 8.7

To have sex with someone else while you have a partner

is the neutral phrasal expression not limited to casual affairs
to cuckold
vsto cheat on
  • NSFW
4 9.9

To cheat on your husband

is the neutral modern phrasal verb for unfaithfulness without archaic tone
to have it off
vsto cheat on
  • NSFW
1 9.9

To have sex with someone, used in informal British English

is used when one partner is unfaithful, not when talking about casual sex
cheating
vsto cheat on
  • NSFW
3.5

Not faithful to a partner by having a romantic or sexual relationship with someone else

is the phrasal verb form describing the same behaviour

How Unfaithful

affair
  • NSFW
837 4.4
to cheat on
  • NSFW
323 3.3
to betray
  • NSFW
76 4.6
unfaithful
  • NSFW
39 4.0

Surface Forms

cheat on infinitive
cheated on past
cheated on past participle
cheating on present participle
cheats on third person singular

Morphology

cheat + on

The verb 'cheat' already encodes the relevant sense of being romantically or sexually unfaithful, and the preposition 'on' functions transparently to mark the person who is the target of that action (cheat on someone). This composed meaning is predictable from the constituents and is a common construction cross-linguistically, so a B1 learner who knows both words will readily infer the MWE meaning.

Etymology

Cheat on may come from the idea of cheat meaning 'to trick' and on showing the action is aimed at someone. Picture a person secretly breaking the rules of a relationship behind their partner's back — that image explains why it means 'to be unfaithful'.