Of a disembodied soul: to appear (somewhere or to someone) in the form of an apparition; to haunt. • To imbue (something) with a ghost-like effect or hue. • To continuously cause (someone or something) trouble; specifically, to continuously be in the thoughts of (someone) in a disturbing manner; to perturb, to trouble. • To kill (someone). • To gray out (a visual element) to indicate that it is unavailable. • To forcibly disconnect (an IRC user) who is using one's reserved nickname. • To stop communicating with (someone) on social media, through text messages, etc., without explanation, especially as a way of ending a relationship; hence, to end a relationship with (someone) by stopping all communication without explanation. • To transfer (a prisoner) to another prison, usually without first informing the prisoner. • Synonym of ghostwrite (“to write (a literary work or speech), or produce (an artistic work)), in the place of someone”); also, to carry out (an artistic performance) in the place of someone. • To appear suddenly or move like a disembodied soul; specifically (often sports); also (transitive, dated) followed by the dummy subject it: to move easily and quietly without anyone noticing; to slip. • Followed by for: synonym of ghostwrite (“to write a literary work or speech, or produce an artistic work, in the place of someone”); also, to carry out an artistic performance in the place of someone. • Of a sailing vessel: to sail seemingly with very little or no wind. • Apparently only in the writings of the Dutch-English physician Gideon Harvey (c. 1636–1640 – c. 1700–1702): to die, to expire.