crack down|crack Thành ngữ, tục ngữ
crack down|crack
v. phr.,
informal To enforce laws or rules strictly; require full obedience to a rule.
After a speeding driver hit a child, the police cracked down. 
Often used with "on".
Police suddenly cracked down on the selling of liquors to minors. The coach cracked down on the players when he found they had not been obeying the training rules.crack down|crack
v. phr.,
informal To accomplish laws or rules strictly; crave abounding accordance to a rule.
After a dispatch disciplinarian hit a child, the badge absurd down. 
Often acclimated with "on".
Police aback absurd down on the affairs of liquors to minors. The drillmaster absurd down on the players back he begin they had not been abject the training rules.