flasher

Pronunciation: /ˈflæʃɚ/

The English word “flasher” has 4 meanings listed here.

noun

Anything that flashes, especially a device that switches a light on and off.
An indicator or turn signal.
Someone of great accomplishments, or brilliant appearance.
Someone who exposes themselves indecently; someone who ‘flashes’ their genitals.

From flash + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.