كبس

كَابُوسٌ ذ [ Incubus, or nightmare; ] what comes upon a man (or rather upon a sleeper, TA,) in the night, (S, K,) preventing his moving while it lasts; (K;) accord. to some, (S,) the forerunner of epilepsy. (S, K.) Some think that this is not Arabic, and that the proper word is نَيْدُلَانٌ, and بَارُوكٌ, and جَاثُومٌ. (TA.) Hence, app., (TA.) (tropical:) Modus certus coëundi: (K:) or rather, (tropical:) coïtus itself. (TA.)