keeping up on (verb) know: understand information
Sinonime: beeline, collinear,
consecutive,
continuous,
direct,
erect,
even, horizontal, in a line, in a row, in line,
inflexible, invariable,
level, like an arrow, lineal, linear,
near, nonstop,
perpendicular, plumb,
precipitous, rectilineal, rectilinear,
right,
running,
sheer,
short,
smooth,
solid,
square,
straightforward,
successive,
through,
true, unbent, unbroken, uncurled, undeviating, undistorted, uninterrupted, unrelieved, unswerving,
upright, vertical
Antonime: curved,
indirect,
twisted