びっくりします（びっくりします、biっkurishimasu）
- to be surprised

The Japanese word びっくりします means "to be surprised," "to be startled," or "to be shocked." It expresses a feeling of sudden surprise or astonishment. It describes the feeling one experiences when something unexpected happens. The feeling can range from mild surprise to strong shock.

⚫︎テストの結果を見て、びっくりしました。 Translation: I was surprised to see the test results. ⚫︎突然の訪問者に、びっくりしました。 Translation: I was startled by the unexpected visitor. ⚫︎あの映画の結末には、本当にびっくりしました。 Translation: I was really shocked by the ending of that movie.

⚫︎びっくりします is used to describe your own feeling of surprise or shock. ⚫︎It is often used after something unexpected happens, like receiving surprising news, seeing something unusual, or experiencing a sudden event. ⚫︎The subject of the sentence usually is "I" or "we" (implied or stated), indicating that you or your group are the ones experiencing the surprise.

⚫︎The base form of the verb is びっくり. ⚫︎It is typically written in hiragana as びっくりします. ⚫︎While the root word びっくり can sometimes be written in katakana as ビックリ, it's less common. ⚫︎The します part is the polite, present tense form of the verb する, meaning "to do".

⚫︎驚きます（おどろきます）： To be surprised, to be astonished (more formal) ⚫︎たまげます（吃驚します）： To be surprised, startled (informal, regional) ⚫︎驚いた（おどろいた）： Surprised (adjectival form) ⚫︎びっくりする（verb form of びっくり without politeness) ⚫︎びっくりします

There aren't direct antonyms, but words that express the opposite feeling could be: ⚫︎安心します（あんしんします）： To feel relieved, to feel at ease ⚫︎落ち着きます（おちつきます）： To calm down

友達からの電話で、びっくりします。 ・Translation: I am surprised by the phone call from my friend. ・Explanation: This sentence shows the speaker's reaction to receiving a phone call. The びっくりします indicates their surprise.

停電で、びっくりしました。 ・Translation: I was startled by the power outage. ・Explanation: This sentence describes the feeling of being startled when the power went out.

The origin of びっくり is thought to be an onomatopoeia, representing the sound or feeling associated with surprise or a sudden shock. It imitates the feeling of suddenness. It does not have kanji, and is mainly written in hiragana.