ras
s.m. al ras cortarse el pelo al ras to crop somebody's hair
a ras de ⇨ the level of
El agua llegó a ras de las ventanas The water reached the level of the windows
volar a ras de tierra to hug the ground
a ras del suelo ⇨ level with the ground
El ala delta volaba a ras del suelo The hang-glider was flying level with the ground