. Соверше́нствуют

 ( Improving , They Are Improving )

 sah-veer-SHENST-voo-yoot
 Verb - Plural - Present Tense - 3rd Person - Continuous
NRT Only: 1
See also   (Смотрите Та́кже) :
 Proverbs 27:17 NRT
17 Как желе́зо оттачивает желе́зо,
17 [How, What, As, Like (comparison)] iron [honing it, sharpens] iron,
так и лю́ди соверше́нствуют друг дру́га.
so and people [improving, they are improving] friend friend.

Iron sharpeneth iron;
so a man sharpeneth the countenance of his friend.
Proverbs 27:17 KJV