react

réagir

Faire quelque chose ou éprouver un sentiment en réponse à ce qu’on entend ou vit.

En anglais simple : If you hear or experience something, you do or feel something because of it.

• How did he react to the news?
• She reacted calmly when the alarm sounded.
• People react differently to criticism.

Comment l'utiliser : react to someone/something (The children reacted well to their new teacher.); react by doing something (He reacted by walking out.); react with something (She reacted with surprise to the invitation.)

Synonymes : respond

Expressions courantes : react to something, react with surprise, react quickly, react with anger

réagir

Subir un changement dans le corps sous l’effet d’un médicament, d’un aliment ou d’une autre substance.

En anglais simple : Your body changes in some way because of a medicine, food, or other substance.

• My skin reacts badly to this soap.
• She reacted to the medicine with a rash.
• Does your body react to certain foods?

Comment l'utiliser : react to something (His skin reacts to some washing powders.)

Synonymes : respond

Expressions courantes : react to medicine, react badly, react to something

réagir

Se transformer au contact d’autres substances, souvent en produisant de nouvelles substances.

En anglais simple : Substances change when they meet, often producing different substances.

• Iron can react with oxygen.
• The chemicals reacted and released gas.
• Scientists react the two substances under controlled conditions.

Comment l'utiliser : react with something (The metal reacts with water.); react to form something (These substances react to form a new compound.)

Expressions courantes : react with oxygen, react with something, react to form

exercer une force opposée

Exercer une force en sens contraire sur l’objet qui exerce une force sur soi.

En anglais simple : An object pushes back against another object that applies a force to it.

• The wall reacts against the force of the ladder.
• Each body reacts on the other with an equal force.
• The support reacted against the downward load.

Comment l'utiliser : react against something (The spring reacts against the applied force.); react on something (The floor reacts on the box with an upward force.)

Synonymes : push back

Expressions courantes : react against something, react on something

réaction

Emoji ajouté à une publication en ligne pour montrer ce qu’on en pense ou ressent.

En anglais simple : An emoji added to an online post to show how you feel about it.

• I left a sad react on her post.
• The video got hundreds of laughing reacts.
• Why did you give my photo an angry react?

Synonymes : reaction

Expressions courantes : a sad react, an angry react, a heart react