Sentence:  The roars of laughter which greeted his proclamation were of two qualities; some men <WSD>laughing</WSD> because they knew all about cuckoo-clocks, and other men <WSD>laughing</WSD> because they had concluded that the eccentric Jake had been victimised by some wise child of civilisation. 
Meaning of the word marked with <WSD> tags:  To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.