To Stare At
To Look At, To View, To Gaze At
transitive verb, ichidan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means stare and the verb vocab version is to stare at (or to look at in a very staringish way).
To learn the reading, just think about how you're looking at something for a lonnnnng time if you're staring at it. In Japanese the word "long" is 長い, and guess what the reading of the kanji part is? It's なが, just like ながめる's kanji-part reading.
うちの甥っ子は新幹線を見るのが好きで、一日中眺めていることもできます。
My nephew likes watching the Shinkansen so much that he can stare at it all day long.