To warn; to alert, advise that caution is warranted.
To give a yellow card
A formal warning given as an alternative to prosecution in minor cases.
Security; guaranty; bail.
A yellow card.
Prudence when faced with, or when expecting to face, danger; care taken in order to avoid risk or harm.
A careful attention to the probable effects of an act, in order that failure or harm may be avoided.
To hide something from view or from public knowledge, to try to keep something secret.