We found 13 dictionaries that define the word drop a line:

General (7 matching dictionaries)

1. drop (someone) a line, drop a line: Merriam-Webster
2. drop a line: Vocabulary.com
3. drop a line: Dictionary.com
4. drop a line: Rhymezone
5. drop a line: FreeDictionary.org
6. drop a line: Mnemonic Dictionary
7. drop a line: TheFreeDictionary.com

Business (2 matching dictionaries)

8. drop a line: Legal dictionary
9. drop a line: Financial dictionary

Computing (1 matching dictionary)

10. drop a line: Encyclopedia

Medicine (1 matching dictionary)

11. drop a line: Medical dictionary

Miscellaneous (1 matching dictionary)

12. drop a line: Idioms

Slang (1 matching dictionary)

13. Drop a line: Urban Dictionary

Definitions from WordNet (drop a line) ▸ verb:  communicate (with) in writing Opposite: pick up phone, call, dial Phrases: drop someone a line, drop us a line, more... ▸ Words similar to drop a line ▸ Usage examples for drop a line ▸ Idioms related to drop a line ▸ Wikipedia articles (New!) ▸ Words that often appear near drop a line ▸ Rhymes of drop a line ▸ Invented words related to drop a line