Figure
Appearance, Form
noun
The kanji and the word are exactly the same. That means they share meanings as well.
姿 refers to the figure or appearance of something. You'll see it used to talk about the physical form or visible impression of a person or thing, like in 後ろ姿 (someone's figure from behind), がんばる姿 (the sight of someone working hard), or 昔の姿 (something's former appearance).
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember:
Who's that figure in the distance? Is that who you think it is? Is that the Sugar Taco (すがた) Man??? YES. You'd know that appearance anywhere. The Sugar Taco Man goes from town to town selling delicious sugary choco-tacos, and nothing makes your day like seeing his form appear on the horizon. Over here, Sugar Taco Man! Sell us some sugar tacos, please!
姿を見る
to see someone's figure, to see something's appearance
姿を消す
to disappear
姿を見せる
to show oneself
姿を表す
to reveal oneself
姿を変える
to change one's form, to transform
自分の姿
one's own appearance
人の姿
human figure
本来の姿
original form
本当の姿
true form
人間の姿
human form
現在の姿
current appearance
アイツは、人間の姿をしたバンパイアで、夜になるとコウモリに姿を変えるんだ。
He is a vampire in human form who changes into a bat at night.
この町の昔の姿と現在の姿は大きく変わった。
This town has changed greatly from how it used to be to how it is now.
ニッコリと笑う母の姿が、今も私の頭に焼き付いている。
The image of my mother smiling is still burned into my mind.
お坊さんが「お金もうけは私にとっては価値のないことだ」と言っている姿に感動しました。
I was moved by the sight of the monk saying, "Making money has no value for me."