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a metal tool with an end with a special shape for holding and turning nuts and bolts (= small metal rings and pins that hold things together) 扳手；扳子；扳钳 
I’ll need a spanner to change the back wheel. 我需要一把扳手来换后轮。
Word Originlate 18th cent.: from German spannen ‘draw tight’ + -er.
Idioms
(throw) a spanner in the works (British English)
(North American English (throw) a (monkey) wrench in the works)
(to cause) a delay or problem with something that somebody is planning or doing 干扰；出难题；从中捣乱