squeaker

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One that squeaks.
2. n. Informal Something, such as an election, that is won, passed, or achieved by the narrowest of margins or at the very last moment.

Century Dictionary and Cyclopedia

1. n. One who or that which squeaks.
2. n. A young bird, as a pigeon, partridge, or quail; a chirper; a peeper; a squealer.
3. n. An Australian crow-shrike of the genus Strepera, as S. cuneicauda (oftener called anaphonensis, after Temminck, 1824, a specific name antedated by the one given by Vieillot in 1816), mostly of a grayish color, 19 inches long: so called from its cries.
4. n. One who confesses, or turns informer.
5. n. A European water-beetle, Pelobius tardus, which is a very loud stridulator. They are sold as curiosities in the London markets.
6. n. Any stridulating crab, as the American lady-crab.

Wiktionary

1. n. One who or that which squeaks.
2. n. A party toy that uncoils with a squeaking sound when blown
3. n. slang An informer
4. n. US A game or election won by a narrow margin
5. n. The Australian gray crow shrike (Strepera anaphonesis).

GNU Webster's 1913

1. n. One who, or that which, squeaks.
2. n. (Zoöl.) The Australian gray crow shrike (Strepera anaphonesis); -- so called from its note.
3. n. colloq., colloq. A contest won by a small margin.
4. n. colloq. A narrow escape from harm.

WordNet 3.0

1. n. something achieved (or escaped) by a narrow margin
2. n. any artifact that makes a squeaking sound when used