Simple past tense and past participle of dab. (verb)
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Use "dabbed" in a sentence
"When you have completely tinted all the pictures and "dabbed" all the colored portions, you may then go over them all again and shade them up where required with rather stronger colors, taking care, however, not to overdo this."
"She dabbed at her eyes with the white linen napkin."
"The waitress absently dabbed at her blood stained shirt with a linen napkin."