A secure position from which it is difficult to be dislodged.
A solid grip with the feet.
Airhead, beachhead, bridgehead, lodgement.
A small round white sticker placed around a punched hole in a piece of paper to prevent the binder's rings from tearing through the paper.
The process whereby a behavior with desirable consequences comes to be repeated.
Additional troops or materiel sent to support a military action.
The act, process, or state of reinforcing or being reinforced.
A thing that reinforces.