measure word · classifier for sheets of paper, stacks, or pads

桌上放着一沓厚厚的报纸。

measure word · existing in large numbers or multiple layers

这里的山峦重沓，景色壮丽。

occurring again and again or in quick succession

喜讯纷至沓来。

proper name · surname Ta

沓先生今天没来上班。