react

B2 · Upper Intermediate Science Technical

v. to change when mixed with another substance.

v. to undergo a chemical change when in contact with another substance or energy source. Often used with 'with'.

日本語:反応する※

“The acid will react with the metal and create small bubbles.”

“When the two compounds react under high pressure, they form a stable polymer that is resistant to heat.”

B1 · Intermediate Computing Informal

v. to use an emoji or icon to show how you feel about a post online.

v. to post a digital reaction, such as an emoji, to indicate a specific emotional response to a message or post.

日本語:反応する※

“I didn't have time to reply, so I just reacted with a heart emoji.”

“Users can now react to individual messages in the thread, allowing for quicker feedback without cluttering the conversation with text.”

B2 · Upper Intermediate Countable noun Computing Slang · Informal

n. an emoji or icon used to show a feeling on social media.

n. a specific emoji or symbolic icon selected by a user to express a sentiment toward a digital post.

“The post got over a hundred likes and several angry reacts.”

“The community manager noted that the 'laugh' react was being used sarcastically on the company's official announcement.”