Simple past tense and past participle of waitress.(verb)
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Use "waitressed" in a sentence
"Forced, as he so often is, to take matters into his own hands, Sheldon tried to cajole Penny into apologizing to Leonard by ambushing her while she waitressed at the Cheesecake Factory."
"Caroline waitressed and drew huge tips, even better than mine."
"I waitressed for 42 years but have Rheumatoid arthritis and asthma."