jammer

Pronunciation: /ˈd͡ʒæmɚ/

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

noun

Any device used to jam radio reception.
A musician who jams.
A device (e.g. a jumar) which will slide along a rope in one direction but not the other, used in rock-climbing, caving etc.
A player who attempts to score points by making their way past other players.

From jam + -er.

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