walking onn. the action of playing a stage role with few or no words to say (frequently attributive); cf. to walk on at walkv. Phrasal verbs 1, walk-onn. 1.
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1934 H. L. Beales & R. S. LambertMem. Unemployed 158 A week's work at a small theatre with Lena Ashwell's company, taking a walking-on part dressed as a Roman soldier.
1982 P. D. JamesSkull beneath Skin vii. 67 She would have had at least a walking-on part in all the plays.