disengager

Etymology

From disengage + -er.

disengager means one who, or that which, disengages. Lexicurio rates it Rare gem — a strength score of 80 out of 100.

noun

One who, or that which, disengages.“Another feature of the working which Major Marindin criticised, was the absence of any separate up home and distant signals for Wivelsfield Station box, which merely controlled the junction signals by disengager apparatus.”