Etymology
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squeal (v.)

c. 1300, probably of imitative origin, similar to Old Norse skvala "to cry out" (see squall (v.)). The sense of "inform on another" is first recorded 1865. Related: Squealed; squealing. The noun is attested from 1747.

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Definitions of squeal
1
squeal (v.)
utter a high-pitched cry, characteristic of pigs;
Synonyms: oink
squeal (v.)
confess to a punishable or reprehensible deed, usually under pressure;
Synonyms: confess / fink
2
squeal (n.)
a high-pitched howl;
From wordnet.princeton.edu