(1)change one's facial expression by spreading the lips, often to signal pleasure
(2)しばしば喜びを示すために、唇を広げて表情を変える
(3)produce laughter
(4)笑いを引き起こす
(5)smile radiantly; express joy through one's facial expression
(6)ニコニコ笑う
(7)顔の表情で喜びを表す