Definition
To put too much water in something; overdilute.
Origins
Originally drown the miller's thumb, meaning to go over the specified mark.
In Context
- "[…] I tell my Bowl Friends, that our ministers have spoilt the punch. Sometimes they give us too much spirit, as when they display a vigour beyond the law; and sometimes, as we say, they drown the Miller, and make sad insipid stuff of it; again they sting our throats with acid; but it is not once in a century that we have cause to complain of an excess of sugar."