Crossword Genius

Lose steam (4)

Ross

I think it could be either:

flag

tire

(Other definitions for flag that I've seen before include "slow down" , "National emblem; tire" , "Give a signal" , "Iris; ensign" , "Iris - banner" .)

I've seen this clue in The Wall Street Journal, the LA Times, the Universal, the USA Today and The New York Times.
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