fall on someone
phrasal verb with fall verb uk/fɔːl/ us/fɑːl/ fell | fallen
怀疑到…的头上
When suspicion falls on a particular person, people think that they may be guilty of doing something bad.
He was the last person to see the woman alive, and suspicion immediately fell on him. 他是那个女人生前最后见到的人，所以一下就怀疑到他头上。