When he handed me the pen my heart was pounding.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means transit, but the vocab isn't quite the same. You are transiting one object over to another person (the word is to hand over), though, so it kind of makes sense. You see the す? You're suing somebody, so you hand over the papers telling them you're suing them. Don't confuse this with 渡る which is "to cross over." す is sue.
The reading is the same as the one you learned with the kanji.