The difference between Arouse and Sex up
When used as verbs, arouse means to stimulate feelings, whereas sex up means to take part in sexual acts with.
check bellow for the other definitions of Arouse and Sex up
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Arouse as a verb:
To stimulate feelings.
Examples:
"The new building proposals in the village are arousing unneeded discomfort."
"to arouse compassion;  to arouse jealousy; to arouse anger"
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Arouse as a verb (euphemism):
To sexually stimulate. To cause an erection of the penis or other physical signs of sexual arousal, such as fluid secretion.
Examples:
"I can't keep my eyes off the dancer; she arouses me greatly."
"I can't wear wool underwear: it tends to arouse me at inappropriate times."
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Arouse as a verb:
To wake from sleep or stupor.
Examples:
"She was snoring and nothing would arouse her."
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Sex up as a verb (transitive, slang):
To take part in sexual acts with.
Examples:
"I wanna sex you up!"
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Sex up as a verb (transitive, slang):
To arouse somebody sexually
Examples:
"Get spanked: it'll sex you up!"
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Sex up as a verb (transitive, slang):
To make more sexually attractive.
Examples:
"Enrique Iglesias' sexed up his music video to appeal to a younger audience."
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Sex up as a verb (transitive, slang):
To enhance in terms of fashionable appeal.
Examples:
"How do I sex up my 3000?"
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Sex up as a verb (transitive, slang):
To sensationalize.
Examples:
"Blair sexed up the evidence to justify his own decision."
"Australia 'sexed up threat posed by Iraq'."
"Australian defence adviser 'sacked for refusing to sex up WMD reports'."