This is the 11608th most frequent Spanish word.
flaquear
To weaken, falter, or lose strength.
In this context, 'flaquear' is used to describe physical weakness or loss of strength.
Juan comenzó a flaquear al subir la montaña.
Juan started to waver while climbing the mountain.
Here, 'flaquear' refers to showing weakness or hesitation before challenges.
No debemos flaquear frente a las dificultades.
We must not falter in the face of difficulties.
In this instance, 'flaquear' indicates hesitancy or lack of confidence expressed through voice.