/ ˈhɒbi; NAmE ˈhɑːbi/ noun
( pl. -ies ) an activity that you do for pleasure when you are not working :
Her hobbies include swimming and gardening.
I only play jazz as a hobby.
➡ note at interest
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WORD ORIGIN
late Middle English hobyn , hoby , from pet forms of the given name Robin . Originally referring to a small horse or pony, it later came to denote a toy horse or hobby horse, hence an activity done for pleasure .