hobby

card 1 of 10 · context meaning

Which meaning of 'hobby' best matches its usage in the sentence?

"Well, I think East is right," said Arthur; "I can't see but what it's right to do the best you can, though it mayn't be the best absolutely. Every man isn't born to be a martyr." "Of course, of course," said East; "but he's on one of his pet hobbies. — How often have I told you, Tom, that you must drive a nail where it'll go."