Denshi Jisho — Online Japanese dictionary

通す とおす to let pass; to overlook; to continue; to keep; to make way for; to persist in
Common word, Godan verb with su ending, Transitive verb 

You can also

Look up kanji details for 通す.

Try a Yahoo Jisho search for 通す .
Try a Goo Jisho search for 通す .
Try a Google search for 通す .