sittherelikealemon (third-person singular simple presentsits there like a lemon, present participlesitting there like a lemon, simple past and past participlesat there like a lemon)
(colloquial) To remain uselessly in a place or situation, without taking any action.
2009, Cathy Hopkins, Mates, Dates Guide to Life:
You can always arrange to see the boys another time or spend time with the boys as a group so you aren't leaving your mate sitting there like a lemon on her own.