(usually contrastive) A poor or underprivileged person. / (uncommon) One who does not have some (contextually specified) thing.

(logic, mathematics) A function that is equivalent to the NOT operator.

(idiomatic) To lack support, as in an argument, debate, or negotiation.

Not any person or thing whatsoever.

Used other than figuratively or idiomatically: see not, see, straight. / (figuratively, colloquial) To be unable to think clearly.

Used to link a semantically weaker word to a semantically stronger word following the adverb, both sharing the same basic meaning, indicating the increased likelihood of the former.

Too many leaders or managers and not enough people doing actual, useful work.

(idiomatic) More or less half of the time; on many occasions but not always; frequently.

(humorous) Used to point out that somebody is in a state of psychological denial.

A phrase telling someone to pursue a path directly without deviations.