latch string
n.
1. A string that opens an old-fashioned door by lifting a small bar.
The early settlers kept the latch string outside the door when they were working around the house, but at night they pulled it to the inside.
2. informal A warm welcome; a friendly greeting.
■ Used in such phrases as "the latch string is out."
Mary has her latch siring out for everyone who comes.
Synonym: WELCOME MAT².

[TahlilGaran] English Idioms Dictionary ▲