Meaning: to wait for the perfect moment to do something. To kill time while the most opportune moment arrives.

Example Sentences:
1.- The big tiger bides time until the zebra had to make its way to the water fountain and then struck.
2.- He is just biding time until the death sentence is executed.

Meaning: to be certain about something’s validity. To be true or legitimate. To be (something) without any doubt about it.

Example Sentences:
1.- The government has clarified beyond a shadow of doubt that the people who have been evading taxes so far will be caught very soon.
2.- I knew beyond a shadow of doubt that he will not keep his word. That is why I did not lend him a single penny for his business.

Meaning: to become superior to someone or thing. To have an edge over. To win or master something.

Example Sentences:
1.- The man has seen many troubled times and is determined to give the better of days to his children.
2.- I am going to get the better of this competition even if it is the last thing that I do.