How to Say "waxing" in Spanish
The Spanish word for “waxing” is “creciente” — A2 level. This is a very common word in everyday Spanish.

Examples
Hay un interés creciente por aprender español.
There is a growing interest in learning Spanish.
La tensión creciente entre los dos países es preocupante.
The increasing tension between the two countries is worrying.
Esta noche veremos la luna creciente.
Tonight we will see the waxing moon.
One Form for All
This word ends in 'e', which means it doesn't change for boys or girls. You say 'el problema creciente' and 'la demanda creciente' without changing the ending.
Where to Put It
In Spanish, this word usually goes after the thing it describes. Say 'tensión creciente' instead of 'creciente tensión' to sound more natural.
Growing vs. Growth
Mistake: “El creciente de la ciudad es rápido.”
Correction: El crecimiento de la ciudad es rápido. Use 'crecimiento' for the act of growth (the noun) and 'creciente' for the description (the adjective).
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