McGraw kissed Hill's hand as they walked out on stage for the first performance of their Soul2Soul tour outside the U.S. and later introduced her to the crowd as "my wife, Mrs McGraw".
"I've got to cut short my workouts", the 50-year-old star, who is known for his washboard abs, said while walking through the terminal with his wife and crew.
As the singer headed out he added that he planned to "shorten my workouts" while flashing a thumbs up to the camera.
"Tim is fine. We've all been a little bit dehydrated traveling so much", she reportedly told the crowd at the time. She also made the decision to end the show at that point and keep Tim from returning to the stage that night.
After the audience chanted "we love Tim", Hill sang an a capella rendition of What a Friend We Have in Jesus, before the lights came up and the audience was ushered out.
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"Tim McGraw was suffering from dehydration in Dublin this evening at the C2C show".
McGraw collapsed onstage while performing his hit "Humble & Kind" on Sunday night.
A representative for the singer said he was treated on-site and "will be fine".
The couple will kick off their Soul 2 Soul world tour on Thursday, May 31, in Richmond, Virginia.
McGraw and wife Faith Hill spent the weekend (March 9-11) performing as part of the Country to Country Festival in the United Kingdom; they headlined in London, England, on Friday night (March 9), Glasgow, Scotland, on Saturday night (March 10), and Dublin on Sunday night.