buoy

The Simple English Wikipedia has an article on:

Buoy

Pronunciation

• (UK) enPR: boi, IPA ^(key): /bɔi/
• (US) enPR: bo͞o'ē, IPA ^(key): /ˈbuːi/

• Audio (UK)

  (file)

• Homophone: boy

Noun

Singular buoy

Plural buoys

1. (countable) A float in water that is used to mark something.

Verb

Plain form buoy

Third-person singular buoys

Past tense buoyed

Past participle buoyed

Present participle buoying

1. (transitive) To float.
2. (transitive) To keep something high.
3. (transitive) To mark/measure with a buoy.