(someone's) tan line

Translations
граница загара
After a day at the beach, her tan line was very noticeable.
После дня на пляже, граница её загара была очень заметна.
Definitions
A visible line on a person's skin that shows the contrast between areas that have been exposed to the sun and have tanned, and areas that were covered and remain lighter in color. This line is usually seen after wearing clothing or swimwear in the sun.
Words
line

noun
линия
tan

adjective
загорелый