defender

The Simple English Wikipedia has an article on:

Defender

defend + -er

• (UK) IPA ^(key): /dɪˈfɛndə(r)/

• Audio (US)

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1. (countable) A defender is someone who defends someone else, usually from violence.
2. (countable) (sports) A defender is a player who tries to stop the other teams from scoring goals or points.