びしっとwith a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)

背筋(せすじ)をビシッと伸(の)ばしましょう。

Let's straighten our backs smartly. {with a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)}

強風(きょうふう)で太(ふと)い枝(えだ)がビシッと折(お)れてしまった。

The thick branch broke cleanly in the strong wind. {with a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)}

スーツを着(き)てビシッと決(き)めた夫(おっと)がカッコイイです。　

My husband, who smartly dressed up in a suit, looks cool. {with a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)}

座禅(ざぜん)中(ちゅう)にあくびをしたら警策(きょうさく)でビシッと肩(かた)を打(う)たれました。

During meditation, I yawned and was sharply struck on the shoulder with a warning stick. {with a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)}

姉(あね)の結婚式(けっこんしき)へは、スーツでビシッと決(き)めて出席(しゅっせき)するつもりです。

I plan to attend my sister's wedding, dressed smartly in a suit. {with a snap, (break) cleanly, (reject) sternly, flatly, smartly (e.g. of dressing up well)}