en_tn/2sa/04/04.md

five years old

the age of Jonathan's son at the time of his father's death (See:rc://en/ta/man/translate/translate-numbers)

crippled in his feet

This phrase means "unable to walk."

nurse

a woman or girl who is hired to look after young children.

became lame

This indicates that Mephibosheth was further injured so he was unable to walk.

Mephibosheth

This is the male name of Jonathan's young son, the grandson of Saul (See: rc://en/ta/man/translate/translate-names)