get under someone's skin meaning

1. To annoy someone
2. To interest someone seriously, to become an obsession with someone

[American idiom]
to bother or irritate someone. (Informal.)
• John is so annoying. He really gets under my skin.
• I know he's bothersome, but don't let him get under your skin.

• get under one's skin:    Verb: get under on ...
• get under so's skin:    [American slang]Fi ...
• get out from under someone:    [American idiom]to ...