deter, discourage -- (try to prevent; show opposition to; "We should discourage this practice among our youth")
discourage -- (deprive of courage or hope; take away hope from; cause to feel discouraged)
warn, discourage, admonish, monish -- (admonish or counsel in terms of someone's behavior; "I warned him not to go too far"; "I warn you against false assumptions"; "She warned him to be quiet")
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