Not even the most vigilant and expert are immune to error.

(US, slang) There is a great number of fools in the world who can be easily swindled, and there always will be.

All possible knowledge of a subject matter. / All possible means, both honest and dishonest

A situation which, contrary to expectation, turned out to be uninteresting, unimportant or unexciting; an anticlimax. / A publicised event which does not take place.

Describes a plant that blooms throughout the growing season.

(idiomatic) Alternative form of every nook and cranny

exactly even, equal / being equal, as in score or account; tied / having nothing due, or no balance of debt on either side

equally, evenly / evenly divided

equity; equilibrium / harmony, balance; parity

Third-person singular simple present indicative form of break even