This is the 5366th most frequent Spanish word.
mantenerlo
"To maintain it" or "to keep it."
'Mantenerlo' refers to keeping an object (it) in a clean state.
Es importante mantenerlo limpio para que funcione correctamente.
It is important to keep it clean for it to work correctly.
'Mantenerlo' refers to keeping a piece of information (it) a secret.
Deberías mantenerlo en secreto hasta que sea el momento adecuado.
You should keep it a secret until the proper time.
'Mantenerlo' refers to keeping an object (it) physically near the speaker.