Sentence examples similar to at the second wavein from inspiring English sources

The phrase "at the second wavein" is not correct in English.
Did you mean "at the second wave in"? If this is the case, you can use it in contexts discussing phases or stages, particularly in relation to events or trends that occur in waves.
Example: "The new policy will be implemented at the second wave in the project timeline."
Alternatives: "during the second wave" or "in the second phase".