to have a secret romantic or sexual relationship with someone other than one's own partner
Phrasal Verbs Using 'On' & 'Upon' - Fooling, Harming, or Treating Badly (On)
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to cheat on
[verb]
Ex:
She
was
devastated
when
she
found out
her
spouse
had
cheated on
her
during
their
vacation
.
to grate on
[verb]
to continually annoy or irritate someone
Ex:
Their
bickering
grated on
everyone
's
nerves
during
the
road trip
.
to jump on
[verb]
to harshly criticize someone for their actions
Ex:
The
employee
jumped on
his
boss
for
his
unfair
treatment
.
to lead on
[verb]
to intentionally deceive someone by making them believe something that is not true
Ex:
to pick on
[verb]
to keep treating someone unfairly or making unfair remarks about them
Ex:
She
felt like
her
colleagues
always
picked on
her
for
her
unique
fashion
sense
.
to pike on
[verb]
to disappoint someone by not fulfilling a commitment or promise
Ex:
They
were
enthusiastic
at first
,
but
piked on
when
the
work
got
tough
.
to play on
[verb]
to take advantage of someone's feelings or weaknesses
Ex:
Scammers
often
play on
the
elderly
's
trust
and
lack
of
tech
knowledge
to
deceive
them
.
to prey on
[verb]
to take advantage of those who are vulnerable or easily fooled
Ex:
The
manipulative
speaker
preyed on
the
fears
and
insecurities
of
the
audience
to
gain
followers
.
to round on
[verb]
to suddenly confront, attack, or shout angrily at someone
Ex:
The
boss
may
round on
employees
who
fail
to
meet
their
deadlines
.
to set on
[verb]
to attack someone aggressively, either physically or verbally
Ex:
I
witnessed
a
disturbing
incident
where
a
group
of
kids
set on
a
classmate
,
and
I
had to
intervene
to
stop
it
.
to weigh on
[verb]
to cause worry or unhappiness due to a problem or responsibility
Ex:
The
responsibility
of
being
the
sole
provider
for
the
family
weighed on
her
,
creating
a
constant
sense
of
pressure
.