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for all

for all idiom

Also, for all that. In spite of, notwithstanding. For example, For all her protests she still loved the attention, or He's too old for the part but he did a good job for all that. [Early 1300s]
for all one cares or knows. So far as one knows; also, one doesn't really care or know. These phrases are employed like a negative. For example, He can buy ten houses for all I care, meaning one doesn't care at all, or For all I know she's gone to China, meaning one doesn't really know where she is. [Mid-1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.