We found one dictionary that defines the word a thin line:

Miscellaneous (1 matching dictionary)

1. a thin line: Idioms

▸ Words similar to a thin line ▸ Usage examples for a thin line ▸ Idioms related to a thin line ▸ Wikipedia articles (New!) ▸ Words that often appear near a thin line ▸ Rhymes of a thin line ▸ Invented words related to a thin line