en_tn_lite_do_not_use/psa/052/002.md

a sharp razor

a sharp blade

Your tongue plans destruction like a sharp razor, working deceitfully

Here the tongue is compared to a sharp razor which is capable of causing great harm. AT: "Your tongue harms people like a sharp razor does, when you plan destruction and deceive others" (See: rc://en/ta/man/translate/figs-simile)

Your tongue

Here "your tongue" refers to the person David is speaking to. AT: "You" (See: rc://en/ta/man/translate/figs-synecdoche)