This is the 4725th most frequent French word.
prenez
"Prenez" means "take" in English.
In this sentence, 'prenez' is used as a command or directive, asking someone to take their coat before leaving.
Prenez votre manteau avant de sortir.
Take your coat before going out.
Here, 'prenez' suggests an action for the person's comfort or benefit, in this case, drinking a glass of water.
Si vous avez chaud, prenez un verre d'eau.
If you are hot, have a glass of water.
In this case, 'prenez' is used metaphorically to encourage someone to care for themselves during their travels.