forearm

nouns

the part of the superior limb between the elbow and the wrist

forearm

is a part of

a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb

is a type of (narrower)

one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper

arm in advance of a confrontation

forearm

is a type of (narrower)

prepare oneself for a military confrontation

"The U.S. is girding for a conflict in the Middle East"; "troops are building up on the Iraqi border"