(Homonym: there, they're).
The possessive case of the personal pronoun they.

1. That which belongs to them — used without a following noun as a pronoun equivalent in meaning to the adjective their
2. His or hers; his, hers — used with an indefinite third person singular antecedent

The objective case of the pronoun they.

The plural of himself, herself, and itself

ETYM Latin oscillatio a swinging.
A periodic change or alternation. In electronics, oscillation refers to a periodic change in an electrical signal.
One complete to-and-fro movement of a vibrating object or system. For any particular vibration, the time for one oscillation is called its period and the number of oscillations in one second is called its frequency. The maximum displacement of the vibrating object from its rest position is called the amplitude of the oscillation.
1. The process of oscillating between states.
2. (Physics) A regular variation in value about a mean; SYN. vibration.

1. Controlling influence.
2. Pitching dangerously to one side

ETYM Latin vacillatio: cf. French vacillation.
The act of vacillating; a moving one way and the other; a wavering.

ETYM From Wag.
(Informal) A witty, amusing person who makes jokes; SYN. wit, card.

1. To cause to dangle or hang freely.
2. To hang freely; SYN. swing, drop.

(Irregular preterit, past participle: swung).
1. To change direction with a swinging motion; turn.
2. To make a big sweeping gesture or movement; SYN. sweep, swing out.
3. To move or walk in a swinging or swaying manner; SYN. sway.
4. To move in a curve.
5. To change drastically.
6. To hit or aim at with a sweeping arm movement.
7. To influence decisively; SYN. swing over.
8. To live in a lively, modern, and relaxed style.
9. To be a social swinger; socialize actively; SYN. get around.

To shake, quiver, or throb; move mack and forth rapidly, usually in an uncontrolled manner.

1. To cause to dangle or hang freely.
2. To hang freely; SYN. swing, drop.

ETYM Latin fluctuare to flow.
1. To be unstable; have ups and downs.
2. To move in an unstable manner; SYN. vacillate, waver.

To move or swing from side to side regularly; as of a pendulum, for example; SYN. vibrate.

1. To move back and forth, like a ship; SYN. sway, shake.
2. To rouse to excitement (as by performing rock music)
3. To become moved backward and forward under often violent impact; also; to move gently back and forth
4. To move forward at a steady pace; also; to move forward at a high speed
5. To sing, dance to, or play rock music

(Irregular preterit, past participle: swung).
1. To change direction with a swinging motion; turn.
2. To make a big sweeping gesture or movement; SYN. sweep, swing out.
3. To move or walk in a swinging or swaying manner; SYN. sway.
4. To move in a curve.
5. To change drastically.
6. To hit or aim at with a sweeping arm movement.
7. To influence decisively; SYN. swing over.
8. To live in a lively, modern, and relaxed style.
9. To be a social swinger; socialize actively; SYN. get around.

To shake, quiver, or throb; move mack and forth rapidly, usually in an uncontrolled manner.

1. A repeated motion from side to side; SYN. waggle, shake.
2. To move from side to side, as of fingers and tails; SYN. waggle.

(Homonym: there, they're).
The possessive case of the personal pronoun they.

1. That which belongs to them — used without a following noun as a pronoun equivalent in meaning to the adjective their
2. His or hers; his, hers — used with an indefinite third person singular antecedent

(Homonym: there, they're).
The possessive case of the personal pronoun they.