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drop a line
law, inf.	листуватися
drop smb. a line
gen.	написати комусь кілька рядків
English thesaurus
drop someone a line
gen.	to contact someone, usually with a letter, note, or phone call (I know you'll be busy enjoying yourself, but please, drop me a line on your trip. • I'll drop you a line once I get settled in at school. thefreedictionary.com)

drop a line: 1 phrase in 1 subject

Informal

1