To Keep Your Arms Crossed For Me

To keep somebody's  arms / legs/ fingers crossed for somebody (V): To wish me luck. (ជូនពរអោយអ្នកណាម្នាក់មានសំណាងល្អ)។
Let's see example:

• A: I am going to have a job interview tomorrow.
• B: Really? I keep my fingers crossed for you.
• A: Thanks!