1A trial or attempt — the act of doing something to see how it turns out, often used in the form「試しに〜してみる」(try doing ~ just to see).
試しに新しいレシピで料理を作ってみた。
I tried making a dish using a new recipe, just to see how it would turn out.
だめでもともと、試しに応募してみることにした。
I figured there was nothing to lose, so I decided to just try applying.
試しに一度着てみてから、買うかどうか決めましょう。
Let's decide whether to buy it after trying it on once.