touch off

Language: en

Meaning: (transitive,idiomatic)Tostart(something); toset offtraps; especially used for unstable situations that may magnify if disturbed.Be cautious talking about religion or politics, lest youtouch offan argument.; (transitive,idiomatic)To cause a fire to start.A sparktouched offthe conflagration.; (machining)To establish a referencecoordinateordatum, by moving the tool head to just touch theworkpieceor machinebed.A traditional method oftouching offuses a piece of thin paper placed between the tool and workpiece.

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