Blow–the–lid–off

a removable or hinged cover for closing the opening, usually at the top, of a pot, jar, trunk, etc.; a movable cover.
an eyelid.
a restraint, ceiling, or curb, as on prices or news.
Slang. a hat, cap, or other head covering.

the cover of the capsule; operculum.
the upper section of a pyxidium.

Slang. one ounce of marijuana.
to supply or cover with a lid.
blow / flip one’s lid, Slang. to lose control, especially to rage hysterically:
He nearly flipped his lid over the way they damaged his car.
Also, flip one’s wig.
blow the lid off, Informal. to expose to public view, especially to reveal something scandalous, illegal, etc.
noun
a cover, usually removable or hinged, for a receptacle: a saucepan lid, a desk lid
short for eyelid
(botany) another name for operculum (sense 2)
(slang) short for skidlid
(US, old-fashioned, slang) a quantity of marijuana, usually an ounce
(Austral, informal) dip one’s lid, to raise one’s hat as a greeting, etc
(slang) flip one’s lid, to become crazy or angry
(informal) put the lid on

(Brit) to be the final blow to
to curb, prevent, or discourage

(informal) take the lid off, to make startling or spectacular revelations about
n.

A hat (1896+)
One ounce of marijuana: a shutdown on grass, lids were going for thirty dollars/ lifted out the back seat and found a lid of marijuana (1960s+ Narcotics)

poor operator (shortwave transmission)
Also, blow wide open. Expose, especially a scandal or illegal activity. For example, The newspaper’s investigation blew the lid off the governor’s awarding state contracts to his friends. [ First half of 1900s ]
see:

blow the lid off
flip one’s lid
put the lid on