Answer: rodeup

AnswerCrossword Clue
RODEUPDidn't stay where it should, as a skirt
RODEUPArrived on horseback
RODEUPJoined the posse in progress
RODEUPShifted, as a skirt
RODEUPBecame uncomfortable, in a way
RODEUPBecame raised, as a skirt