Am I failing to get a point here?
Collins English Dictionary:
as often as not: quite frequently
as likely as not: very probably
Considering the meanings of these phrases, to my eye, they come to have connotations not in line with their real meanings.
Before consulting my dictionary I envisaged that as often as not would most probably mean just about never rather than quite frequently, and that as likely as not would be associated more with impossibility than with high probability.In short, I expected not, in the phrases above, to have the same implication as nothing does in, for example, as good as nothing.
Do you think not in these phrases is of some connotation different from what its commonplace definitions convey? Do you ever believe the component words preserve their meanings after these phrases are broken down and thus, are we supposed to treat the phrases the way idioms are treated?
I found one answer, but with no reference so far.
Best Answer
You are confusing two different constructions.
For the meaning you are after, you would have to use an actual quantifier: "as often as ten times a week", "as often as twice a year", "as often as every Tuesday", "as often as never". This follows the pattern of phrases like "as recently as last Tuesday", or "as soon as tomorrow". Basically with phrases of this kind you say that it's often/recent/soon, and then immediately quantify just how often/recent/soon it is.
Not is a completely different part of speech, it does not fit the pattern. "It happens as often as not" is a simple ellipsis of "it happens as often as [it does] not". So 50% of the time. This is a different pattern, compare it to another common phrase "more often than not". Which, again, does not mean "more often than never", but rather "for every time X does not happen, it does happen at least once". So 50+%. It happens more often than [it does] not.
Likewise for "as likely as not". If you are after solid examples, you can search the Corpus of Contemporary American English (COCA), which has 18 cites, or the British National Corpus (BNC), which has 21. Here are some of them:
Follow the links for more examples.