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has been decomposing

  • present perfect progressive
    of decompose (3rd person singular).
    decompose
    verb (used with object)
    to separate or resolve into constituent parts or elements; disintegrate.

Example Sentences

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As rapid warming in the region has caused more of the topmost frozen layer to thaw, organic matter has been decomposing and emitting carbon dioxide and methane.

From New York Times Apr. 11, 2022

"No, madam, but I hear he has been decomposing for some time!"

From Ever Heard This? Over Three Hundred Good Stories by F. W. Chambers