employing or utilizing a written message, as opposed to verbally or through other means.

(idiomatic) Expletive used for emphasis, for example after an interrogative word. / Used for emphasis after a qualified noun.

(idiomatic) immediately, instantaneously

simple past tense and past participle of sub in

Third-person singular simple present indicative form of sub in

(especially sports) To replace something or take someone's place,

present participle of sub in

(literally) targeted at the point of intersection of the two perpendicular lines in a gunsight or scope / (idiomatic) subject to close scrutiny

Alternative form of tap in

(shooting) A second (or subsequent) shot fired at a downed animal to ensure it is dead.