Meaning

• A graduated, circular scale over which a needle moves to show a measurement (such as speed).

• A clock face.

• A sundial.

• A panel on a radio etc showing wavelengths or channels; a knob that is turned to change the wavelength etc.

• A disk with finger holes on a telephone; used to select the number to be called.

• A person's face.

• A miner's compass.

Meaning

• To control or select something with a dial, or (figuratively) as if with a dial.

  "President Trump has recently dialled down the rhetoric."

• To select a number, or to call someone, on a telephone.

  "In an emergency dial 999."

• To use a dial or a telephone.

  "Please be careful when dialling."