en_tn_lite_do_not_use/2th/03/14.md

if anyone does not obey our word

"if anyone does not obey our instructions"

take note of him

Notice who he is. Alternate translation: "publicly identify that person" (See: rc://en/ta/man/translate/figs-idiom)

so that he may be ashamed

Paul instructs believers to shun lazy believers as a disciplinary action.