Example
Recorded usage
These full forms were measured in COCA in 2016–2017. Counts apply to the quoted form, not every use of this idiom; overlapping forms are not added together.
Grouped source variants; editorially classified here as an idiom. Usage counts are separate from CEFR difficulty.
Dictionary details
Component words
Related idioms
Expressions connected by reviewed component words or topic tags.
water off a duck's back
CEFR B2criticism that has no effect on someone
rubber duck debugging
CEFR C1to debug or solve a problem by explaining it line by line, out loud, to an inanimate object such as a rubber duck
easier said than done
CEFR B1Something that sounds simple to do but is actually hard.
for the time being
CEFR B1temporarily, until circumstances change
save for a rainy day
CEFR B1to put money aside for future emergencies
back to square one
CEFR B2to return to the beginning of a task after an attempt has failed
Source methodology
Meanings, register, CEFR, and examples come from the reviewed dictionary record. Expression notes may describe a reviewed present-day word picture or a background note; they are not presented as verified etymology.