v fix firmly and stably
v confine or restrict to the ground
v place or put on the ground
v instruct someone in the fundamentals of a subject
v bring to the ground
v hit or reach the ground
v throw to the ground in order to stop play and avoid being tackled behind the line of scrimmage
v hit a groundball
v hit onto the ground
v cover with a primer; apply a primer to
v connect to a ground
v use as a basis for; found on
a. [物]接地的；有基础的