A solid grip with the feet.
A secure position from which it is difficult to be dislodged.
Airhead, beachhead, bridgehead, lodgement.
A prop or strut supporting some structure or weight above it.
Land, usually near a port.
A sewer.
Land adjoining a non-flowing body of water, such as an ocean, lake or pond.
Not followed by up: to provide (something) with support.
Usually followed by up: to reinforce (something at risk of failure).
simple past tense of shear