From Longman Dictionary of Contemporary Englishlechlech1, letch /letʃ/ verb → lech after/over somebodylechlech2, letch (also letcher /ˈletʃə $ -ər/) noun [countable] SEX/HAVE SEX WITHa man who shows his sexual desire for women in a way that is unpleasant or annoyingOrigin lech (1900-2000) lecher