Crossword puzzle clue "rock solid as a case"

Here are the possible solutions for rock solid as a case clue

Answer
Clue
Relevancy
airtight
Clue
Rock-solid, as a case
Definition
impermeable to air
similestone
Clue
"Rock" in "solid as a rock," in Spain?
asa
Clue
Solid ___ rock
Solid rock center?
Solid ___ rock: 2 wds.
Solid __ rock
Solid -- rock
Solid/rock insert

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