n. 25B6; noun
the arm of her jacket : SLEEVE.
an arm of the sea : INLET, creek, cove, fjord, bay, voe; estuary, firth, strait(s), sound, channel.
the political arm of the group : BRANCH, section, department, division, wing, sector, detachment, offshoot, extension.
the long arm of the law : REACH, power, authority, influence.