watch and ward
Argus-eyed
everwatchful
keep cave
vigilantness
ever-watchful
on guard
on one's guard
on your guard
upon one's guard
watchfulness
wakeful
weather eye
vigilance
hypervigilantly
keep a lookout
open-eyed
keep an eye open
supervigilant
ward
hypervigilant
on watch
circumspection
vigilantly
waker
tutelary
tutelar
custodial
wariness
jealousy
wary
overcautious
slowball
stand guard
off guard
look after
preveniently
cautiousness
unwinking
vigilant
hypovigilant
watchful
foresighty
argus-eyed
keep one's stick on the ice
discreetness
periergy
heads-up
cautionary
uncautiousness