Etymology
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bike (n.)

1882, American English, shortened and altered form of bicycle (n.). As a verb by 1895. Related: Biked; biking.

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Definitions of bike
1
bike (n.)
a motor vehicle with two wheels and a strong frame;
Synonyms: motorcycle
bike (n.)
a wheeled vehicle that has two wheels and is moved by foot pedals;
Synonyms: bicycle / wheel / cycle
2
bike (v.)
ride a bicycle;
Synonyms: bicycle / cycle / pedal / wheel
From wordnet.princeton.edu