get under someone's skin

1

Irritate someone, as in She really knows how to get under my skin with her nagging. This expression no doubt alludes to burrowing or stinging insects that cause itching or similar skin irritations. [Late 1800s]

2

Obsess someone or affect someone's deep feelings, as in Jean's really gotten under his skin; he misses her terribly. Cole Porter used this sense in his love song, “I've Got You Under My Skin” (1936).

Words nearby get under someone's skin

get to the heart of, get to the point, get together, get tough with, get under one's skin, get under someone's skin, get up, get up on the wrong side of bed, get up on the wrong side of the bed, get up one's nerve, get up steam