S: (n) unit, social unit (an organization regarded as part of a larger social group) "the coach said the offensive unit did a good job"; "after the battle the soldier had trouble rejoining his unit"
S: (n) precaution, safeguard, guard (a precautionary measure warding off impending danger or damage or injury etc.) "he put an ice pack on the injury as a precaution"; "an insurance policy is a good safeguard"; "we let our guard down"
S: (v) guard (to keep watch over) "there would be men guarding the horses"
S: (v) guard, ward (watch over or shield from danger or harm; protect) "guard my possessions while I'm away"
S: (v) defend, guard, hold (protect against a challenge or attack) "Hold that position behind the trees!"; "Hold the bridge against the enemy's attacks"
S: (v) guard (take precautions in order to avoid some unwanted consequence) "guard against becoming too friendly with the staff"; "guard against infection"
S: (v) act, move (perform an action, or work out or perform (an action)) "think before you act"; "We must move quickly"; "The governor should act on the new energy bill"; "The nanny acted quickly by grabbing the toddler and covering him with a wet towel"