dḳḳ - to crush; to become fine through grinding
(HALOT 229)
daḳ ‘thin; scarce; fine; small, soft’ (HALOT 229)
PS
*dḳḳ - to crush, to pound; to be ground finely, to be fine, minute
(EDA II)
For the frequent in individual Semitic languages semantic shift ‘to be ground finely, to be fine, minute’ > ‘to be little, smalľ in Indo-European languages see Buck 1949, 880ff.