Etymology
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sway (v.)

early 14c., "move, go, go quickly; move (something) along, carry," probably from a Scandinavian source akin to Old Norse sveigja "to bend, swing, give way," Old Danish svegja, perhaps merged with an unrecorded Old English cognate. The whole group might be related to swag (v.) and swing (v.).

The sense of "swing, waver, move in a swaying or sweeping motion" is from late 14c. Meaning "move from side to side" is from c. 1500; transitive sense "cause to move from side to side" is from 1550s (according to OED, not common before 19c.). Figurative sense "cause to be directed toward one side, prejudice" is from 1590s. Related: Swayed; swaying.

sway (n.)

c. 1300, "movement from side to side," from sway (v.). The meaning "controlling influence" (as in to be under the sway of) is from 1510s, from a transitive sense of the verb in Dutch and other languages.

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Definitions of sway
1
sway (v.)
move back and forth or sideways;
the tall building swayed
Synonyms: rock / shake
sway (v.)
move or walk in a swinging or swaying manner;
Synonyms: swing
sway (v.)
win approval or support for;
His speech did not sway the voters
Synonyms: carry / persuade
sway (v.)
cause to move back and forth;
the wind swayed the trees gently
Synonyms: rock
2
sway (n.)
controlling influence;
sway (n.)
pitching dangerously to one side;
Synonyms: rock / careen / tilt
From wordnet.princeton.edu