What the meaning of the word train up a child as found in the in proverbs 226?

“Train a boy in the way he should go; even when he grows old he will not depart from it.”—Proverbs 22:6, New World Translation.

The meaning is that parents who teach their children to love God and respect his commandments can expect the training to have a positive and a lasting influence. Parents can help their children to grow into mature and responsible adults who can make good decisions. The way he should go refers to the way of life taught in God's Word, The Bible. When parents train their children to follow God's standards, they will give them the best opportunity to be successful in life. Proverbs 2:11, "Thinking ability will keep watch over you, And discernment will safeguard you,"

(New World Translation of the Holy Scriptures)