masturbate

v [I, Tn] give (oneself/sb) sexual pleasure by stimulating the genitals, esp by hand （刺激生殖器）给（自己[某人]）性快感; （尤指）手淫.

master class, Master of Ceremonies, master sergeant, Master's degree (also Master's), master-key, master-stroke, masterful, masterfully, masterly, mastermind, masterpiece, mastery, mastic, masticate, mastication, mastiff, mastitis, mastodon, mastoid, mastoiditis, masturbation, masturbatory, mat, matador, match, match point, matchbox, matched, matchless, matchmaker, matchmaking, matchstick, matchwood, mate, material, materialism, materialist, materialistic, materialistically, materialization, materialisation,