A glacial abrasional form, with striated sides and base, orientated approximately parallel to the ice-flow direction, and commonly up to a few metres wide and deep

Groove with striated sides cut in limestone bedrock, Glacier de Tsanfleuron, Valais, Switzerland. Photo J. Alean

https://www.swisseduc.ch/glaciers/glossary/groove-tsanfleuron-en.html