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Longman Dictionary of Contemporary English
two-way street
noun
EXAMPLES FROM OTHER ENTRIES
▪ Education is a two-way street.
EXAMPLES FROM CORPUS
▪ But creative collaboration is a two-way street.
▪ But the link between diagnosis and treatment is a two-way street.
▪ The superiors, however, saw these responsibilities as more of a two-way street than did the subordinates.
Wiktionary
two-way street

n. (context idiomatic English) A social interaction in which both parties are expected to give and take equally.

WordNet
two-way street

n. a street on which vehicular traffic can move in either of two directions; "you have to look both ways crossing a two-way street"

Wikipedia
Two-way street

A two-way street is a street that allows vehicles to travel in both directions. On most two-way streets, especially main streets, a line is painted down the middle of the road to remind drivers to stay on their side of the road. Sometimes one portion of a street is two-way, the other portion one-way. If there is no line, a car must stay on the appropriate side and watch for cars coming in the opposite direction and prepare to pull over to let them pass.

Usage examples of "two-way street".

In humans loyalty is a two-way street, and the hive gave none of the emotional return humans require above such physical things as nutrition.

And the direct neuron interface with the jumpjet was a two-way street.