thank lucky stars
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thank (one's) lucky stars
To express appreciation for a beneficial occurrence. You should thank your lucky stars that you managed to avoid that violent car accident. We thank our lucky stars that we were able to get a home in this neighborhood at such a reasonable price.
thank one's lucky stars
Fig. to be thankful for one's luck. You can thank your lucky stars that I was there to help you. I thank my lucky stars that I studied the right things for the test.