Denshi Jisho — Online Japanese dictionary

独り立ち ひとりだち being independent; standing on one's own; becoming independent
Noun, Suru verb 

You can also

Look up kanji details for 独り立ち.

Try a Yahoo Jisho search for 独り立ち .
Try a Goo Jisho search for 独り立ち .
Try a Google search for 独り立ち .