idiomUKinformalthe use of two or moreactionsinorderto beextracarefulabout something,althoughonly one is reallynecessary:双保险,万无一失Iwroteto them andphonedas well -beltandbraces, Iadmit.我既写了信又打了电话给他们——我想应该万无一失了。SMART Vocabulary: related words and phrasesCautious and vigilant
abundance
an abundance of cautionidiom
askance
attentive
attentively
conservatively
diligence
diligent
discreet
due diligence
meticulous
meticulously
meticulousness
mindful
minutely
sedulous
sedulously
slowly
super-cautious
super-conservative
See more results ?(Definition ofbelt and bracesfrom theCambridge Advanced Learner's Dictionary & Thesaurus? Cambridge University Press)#https://dictionary.cambridge.org//dictionary/english/belt-and-braces##