noun
speedo
noun
1
An informal, shortened term for a speedometer, the dial that shows how fast a vehicle is going.
"He glanced at the speedo and eased off the accelerator."
"The speedo on this old car reads a bit high."
2
A close-fitting swimsuit, especially the brief style worn by competitive swimmers (from the brand name Speedo).
"The lifeguard wore a speedo for his training sessions."
How to Use Speedo
Learner’s notesIn plain EnglishEither a casual word for the dashboard speed dial, or (from the brand) a tight swim brief.
Common pairings
check the speedo
wear a speedo
Word Forms
speedos plural, Speedos plural
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Etymology
Shortened from "speedometer"; the swimwear sense comes from the Australian brand name Speedo, first used as a trademark in the 1920s.