Keep yours fingers crossed!
用：说这句话表示求神保佑一切顺利如意，希望不要有意外事情妨碍计划、安排等。有人也说cross his fingers，多是小孩说的，边说边做这个手势，乞求减轻说谎的罪过。
例：Let's hope the TV works now that I've repaired it. Keep your fingers crossed!
Terry had his fingers crossed when he told his dad the lie.
A: I'm going for a job interview tomorrow.
B: Oh, fingers crossed!