The parents bought their noisy child a new toy to appease him.

appease 是动词，意思是"平息、安抚、使平静"。这个词由前缀 ap-（表示"朝向"）和词根 pease（来自拉丁语 pax，意为"和平"）组成，字面意思是"使趋向和平"，引申为"安抚、平息"的意思。