one-way

Từ điển Oxford Advanced Learner 8th

ˌone-ˈway [one-way] BrE NAmE adjective usually before noun
1. moving or allowing movement in only one direction
•one-way traffic
•a one-way street
•a one-way valve
2. (especially NAmE) (BrE also sin·gle)a one-way ticket, etc. can be used for travelling to a place but not back again
•a one-way trip
• I took the car on a one-way trip to the wrecker's yard (= it did not come back because it was not worth fixing).
compare ↑return _n. (⁷)
3. operating in only one direction
• Theirs was a one-way relationship (= one person made all the effort).
•They observed the prisoners through a one-way mirror (= a mirror that allows a person standing behind it to see through it).
See also: ↑single