Defender Graham said: “It's big but we've got a lot of big characters with good quality as well. So I know next time out we'll put things right.
“Of course everyone's disappointed after that game but there's still a lot to play for this season. So we need to quickly put that behind us.
"We've got a long time until the next game, two weeks. So we need to get that out of our heads today and push on for the next one - and hopefully try to achieve the outcomes we've set for ourselves.”
United still sit fifth but seventh-placed Motherwell are now just three points behind with three games before the split.
Graham added: "We know what our outcomes are internally. We know what we're striving for. I think the aim at the start of the season was to stay up and you've seen how well we've done. So we want to keep pushing forward and secure the top six now.
"Results went in our favour last weekend. We couldn't capitalise on that so we're kind of disappointed in that sense as well. But we've still got three games to the split and there's a lot to play for." United's success this season has been based on solid foundations but they disappeared on Sunday against a resurgent Dark Blues side.
Defensively, United we...