裏声 is read as うらごえ (uragoe) and means falsetto.
うらごえ
uragoe
こえがうらがえる
to crack (person's voice)
うらどおり
side street (often parallel to a main street)
うらぎる
to betray
うらぐち
backdoor
りめん
back (side)
うらがえし
inside out
うらおもて
inside out (e.g. clothing)
うらがえす
to turn inside out
うらじ
land that does not adjoin to public or private roads
うらづける
to support (a theory, claim, etc.)
うらみち
unfair means
うらがね
bribe