блюсти

Etymology
From.

Verb

 * 1) to watch, guard
 * 2) to be careful, beware
 * 3) * from Codex Marianus, 3210800:
 * "cu"

- блюдѣте сѧ да не прѣльщени бѫдете ·

Etymology
, from, from , from.

Verb

 * 1) to guard, to keep