drain off(redirected from draining off)
To flow or move off of something. A noun or pronoun can be used between "drain" and "off." Now that we've fixed the gutters, the rain should drain off of our roof nicely.
drain something off somethingand drain something off to cause or permit something
to flow from the surface or contents of something. Drain some of the broth off the chicken. Drain off the fat at the bottom of the pan.