Idiom

Question 1

A plum in your mouth

Answer 1

also plums in your mouth)
a way of speaking that is typical of people of a high social class:
She had elocution lessons as a child and as a result now speaks with a plum in her mouth.
He’s a bit like Hugh Grant without the plum in his mouth.
SMART Vocabulary: related words and phrases
Class & class-consciousness in general

Question 2

a pig in a poke

Answer 2

something that you buy or accept without first seeing it or finding out if it is good
SMART Vocabulary: related words and phrases
Unknown and unfamiliar

Question 3

Muddy the water

Answer 3

muddy the waters

to make a situation more confused and less easy to understand or deal with
SMART Vocabulary: related words and phrases
Puzzle and confuse

to make a situation unnecessarily complicated and less clear:
His suggestions just muddied the waters further, rather than helping the situation

Question 4

That is the mission at hand

Answer 4

at hand

happening or present at this time:
The space shuttle crew must stay completely focused on the task at hand.

C1
near in time or position:
We want to ensure that help is at hand (= easily available) for all children suffering abuse.