Affidavit for attachment

What does Affidavit for attachment mean in American Law?

The definition of Affidavit for attachment in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

An affidavit which must in almost all jurisdictions be executed by a plaintiff seeking a writ of attachment. The affidavit must ordinarily set out some ground why property of the defendant should be seized or otherwise made nontransferable prior to hearing or judgment, e.g., it is about to be hidden or destroyed. See attachment for the current constitutional status of attachments sought to be made on the basis of affidavit only.