To return an impulse or impression; to resist the action of another body by an opposite force
To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.
To post a reaction (icon or emoji indicating how one feels about a posted message).
To act in response.
To cause chemical agents to react; to cause one chemical agent to react with another.
An emoji used to express a reaction to a post on social media.
To cause to reverse direction and retrace one's steps.
To return to a previous state of being.
To reverse direction and retrace one's steps.
To prevent or refuse to allow passage or progress.
To adjust to a previous setting.
To fold something back; to fold down.