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