What is infuse?
one answer is to extract the flavor of a substance by placing it in a hot liquid.
For example tea bag put in hot water to make tea. The flavor escapes into the water.
Infuse means to pour and is usually used in medical scenarios, for example to infuse tea or herbs for a soothing drink is to pour hot water on them. From this use it also comes to mean revitalise, eg 'The bank hoped that by infusing some fresh funds into the profitable operations it could turn the company around.'