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lose your marbles

Idiom Mental

Meaning

to become crazy or mentally unstable

Example Sentences

"My boss must have lost his marbles to approve such a risky project."

Related Expressions

a heart-to-heart

a sincere and open conversation

know something by heart

to memorize something perfectly

if you ask me

used when giving a personal opinion, often without being ask...

the upper hand

to have control or an advantage over someone

find your feet

to become comfortable in a new situation

pull the wool over someone’s eyes

to deceive or trick someone