to steep (tea, herbs, etc) in liquid without boiling so as to extract the flavour, soluble properties, etc
to imbue or pervade (something)
A pink tinge infused the evening sky
to instil (a quality or value) in somebody or something
in medicine, to cause (a liquid, esp blood or plasma) to flow gradually into a person, vein, etc
infuser noun
[Middle English infusen via French from Latin infusus, past part. of infundere to pour in, from in-2 + fundere to pour]