| a prefixal use of out, adv., occurring in various senses in compounds (outcast, outcome, outside), and serving also to form many transitive verbs denoting a going beyond, surpassing, or outdoing in the particular action indicated (outbid, outdo, outgeneral, outlast, outstay, outrate). |
| out- pref. In a way that surpasses, exceeds, or goes beyond: outdistance. [From out.] |
