Biarritz marksman Dimitri Yachvili punished Bath’s indiscipline by kicking four penalties – the last one 10 minutes from time after home prop David Wilson was sin-binned – to clinch a 12-11 Pool Four verdict.
It means Bath, beaten despite building an early 8-0 lead through Michael Claassens’ smart try and an Olly Barkley penalty, are already battling to avoid a repeat of last season’s pool stage exit.
“It’s actually quite difficult to put into words,” said head coach Meehan. “We played a very good first half but a few technical penalties went against us in the second half.
“And then with four minutes to go, we had an opportunity to win, but we didn’t take it. It was a better performance than last week (against Gloucester), yet to come up short like that is very frustrating.”
Meehan added: “Biarritz were happy to live off our penalties to begin with in the second half. They ticked over three points at a time.
“We’ve got to grow up and take the points. It’s straightforward, it is about being ruthless, getting the job done. Simple.
BATH: Abendanon, Carraro, Hape, Barkley, Banahan, Vesty, Claassens, Catt, Dixon, Wilson, Hooper, Grewcock, Beattie, Watson, Taylor.
Replacements: Flatman for Catt (53), Batty for Dixon (75), C. Fernandez Lobbe for Grewcock (63).
BIARRITZ: Haylett-Petty, Ngwenya, Gimenez, Bond, Balshaw, Peyrelongue, Yachvili, Coetzee, Terrain, Johnstone, Carizza, E. Lund, M. Lund, Harinordoquy, Lakafia.
Replacements: Mignardi for Bond (67), Traille for Peyrelongue (61), August for Terrain (51), Marconnet for Johnstone (51), Taele-Pvihi for Carizza (67), Guyot for Lakafia (73).
Referee: J Jones (WRFU).