(n): complete attention; intense mental effort
(n): maximum clarity or distinctness of an image rendered by an optical system
(n): the quality of being sharp and clear
(n): maximum clarity or distinctness of an idea
(n): free from obscurity and easy to understand; the comprehensibility of clear expression
(n): a central point or locus of an infection in an organism
(n): the precise location of something; a spatially limited location
(n): special emphasis attached to something
(n): special importance or significance
(n): a point of convergence of light (or other radiation) or a point from which it diverges
(n): the precise location of something; a spatially limited location
(n): a fixed reference point on the concave side of a conic section
(n): the precise location of something; a spatially limited location
(v): direct one's attention on something
(v): use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
(v): cause to converge on or toward a central point
(v): make (images or sounds) sharp or sharper
(v): bring into focus or alignment; to converge or cause to converge; of ideas or emotions
(v): place in a line or arrange so as to be parallel or straight
(v): become focussed or come into focus
(v): adapt or conform oneself to new or different conditions
(v): put (an image) into focus
(v): alter or regulate so as to achieve accuracy or conform to a standard
... for applying significant pressure on the center portion of the skateboard to break the board in half.