Definitions for crack down
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Princeton's WordNet
clamp down, crack down(verb)
repress or suppress (something regarded as undesirable)
"The police clamped down on illegal drugs"
Kernerman English Learner's Dictionary
crack down(verb)æk
to begin to strictly enforce rules or laws
police cracking down on drug dealing
Wiktionary
crack down(Verb)
To enforce more stringently or more thoroughly.
Citation
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"crack down." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/crack down>.