The Collaborative International Dictionary of English v.0.48:
Chaperon \Chap"er*on\, v. t. [imp. & p. p. Chaperoned; p. pr. & vb. n. Chaperoning.] [Cf. F. chaperonner, fr. chaperon.] To attend in public places as a guide and protector; to matronize. [1913 Webster] Fortunately Lady Bell Finley, whom I had promised to chaperon, sent to excuse herself. --Hannah More. [1913 Webster]