From tsamaq; a cake of dried grapes -- bunch (cluster) of raisins.
see HEBREW tsamaq
H6778. tsimmuq
[צִמּוּק] noun masculine1 Samuel 30:12 bunch of raisins (dried grapes); — plural צִמֻּקִים 25:18; 30:12, צִמּוּקִים 2 Samuel 16:1; Chron 2 Samuel 12:41 (van d. H. 2 Samuel 12:40).
צמר (√ of following; Late Hebrew צֶמֶר = Biblical Hebrew; Ethiopic Aramaic עַמְרָא, ; Palmyrene עמרא).