transitive verb1: to stain the character or reputation of :disgrace 2: to mark in or with a spot :stain 3: to locate or identify by a spot 4 a: to single out :identify; especially: to note as a known criminal or a suspicious person b:detect, notice<spot a mistake>c (1): to locate accurately <spot an enemy position>(2): to cause to strike accurately <spot the battery's fire> 5 a: to lie at intervals in or over :studb: to place at intervals or in a desired spot <spot field telephones>c: to fix in or as if in the beam of a spotlight d: to schedule in a particular spot or at a particular time 6: to remove a spot from 7: to allow as a handicapintransitive verb1: to become stained or discolored in spots 2: to cause a spot 3: to act as a spotter; especially: to locate targets 4: to experience abnormal and sporadic bleeding in small amounts from the uterus