monkey wrench

Từ điển Oxford Advanced Learner 8th

ˈmonkey wrench [monkey wrench monkey wrenches] BrE NAmE (BrE also ˌadjustable ˈspanner) noun
a tool that can be adjusted to hold and turn things of different widths
compare ↑spanner, ↑wrench
Idiom: ↑throw a monkey wrench in something
See also: ↑adjustable spanner ▪ ↑throw a wrench in something