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Answer for the clue "Render a credit card useless, e.g ", 11 letters:
demagnetize

Word definitions for demagnetize in dictionaries

Wiktionary Word definitions in Wiktionary
vb. 1 To make something nonmagnetic by removing its magnetic properties. 2 To erase the contents of a magnetic storage device.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Demagnetize \De*mag"net*ize\, v. t. To deprive of magnetic properties; to render nonmagnetic. See Magnetize . If the bar be rapidly magnetized and demagnetized. --Am. Cyc. To free from mesmeric influence; to demesmerize. [archaic] [1913 Webster +PJC] -- ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1839; see de- + magnetize .\nRelated: Demagnetized ; demagnetizing .

WordNet Word definitions in WordNet
v. erase (a magnetic storage device) [syn: demagnetise ] make nonmagnetic; take away the magnetic properties (of); "demagnetize the iron shavings"; "they degaussed the ship" [syn: demagnetise , degauss ] [ant: magnetize , magnetize ]

Usage examples of demagnetize.

With a flick at the switch he turned off its current and momentarily demagnetized it.

He demagnetized the cable again, and flicked it downward, rising six inches into the air as he did so.

They demagnetized their boots, and from spools on their belts, small motors pulled them to the hatch, where they disappeared into the airlock.