asservo

ad-servō (ass-) āvī, ātus, āre,

to watch over, keep, preserve, guard: tabulae neglegentius adservatae: navīs: portas, Cs.: cura adservandum vinctum, have him kept under close guard, T.: ius: Vitrubium in carcerem adservari iussit, cast into and kept in, L.