get under someone's skin
US /ɡɛt ˈʌndər ˈsʌmˌwʌnz skɪn/
UK /ɡɛt ˈʌndər ˈsʌmˌwʌnz skɪn/

1.
to annoy or irritate someone intensely
:
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His constant complaining really gets under my skin.
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I try not to let negative comments get under my skin.
2.
to deeply affect someone emotionally, often in a positive way, causing them to think about something for a long time
:
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That powerful documentary really got under my skin; I can't stop thinking about it.
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Her kindness and resilience got under his skin, making him rethink his own priorities.